初中级英语：一般现在时被动语态练习题及答案

这是一份初中级英语：一般现在时被动语态练习题及答案，共17页。
初中英语：一般现在时被动语态练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．Tea is grown drinking. I to drink four times a day
A．for; am asked B．to; was asked C．as; ask D．by; asked
2．—My grandpa has a small garden. He always keeps it _______.
—Oh! I know. It's said that it ________ every day.
A．cleaning; is cleaned B．cleaned; has cleaned
C．clean; is cleaning D．clean; is cleaned
3．How many trees ______ every year?
A．are planted B．will plant
C．have been planted D．planted
4．—Don't smoke here, Dad. Smoking ___________in public places.
—Oh, sorry. I'll stop right now.
A．isn't allowed B．aren't allowed C．doesn't allow D．not allows
5．—Is the kite ________ now?
—Yes, we can fly it this afternoon.
A．do B．done C．doing D．does
6．With the development of China, Chinese _________________by a large number of people in the world.
A．speaks B．is spoken C．speak D．is speaking
7．Today we are still influenced ________________ his thoughts.
A．in B．of C．by D．with
8．Sanya ___________ to be a good place for travelling today.
A．knows B．knew C．is well-known D．was well-known
9．Since your homework ____________ , you can go skiing with Nick.
A．is done B．will do C．will be done D．has done
10．—Claudia, are you going to Mike's birthday party on Sunday?
—Unless I ____________.
A．am invited B．invited C．was inviting D．invited
11．— Have you finished your report on green life?
— Not yet. I'll make it if I _________________ another two days.
A．give B．am given C．will give D．will be given
12．FIFA World Cup every four years.
A．is held B．was held C．will be held
13．A lot of things ________ in Oxfam shops, _________ books.
A．sell; including B．are sold; including
C．sell; include D．are sold; include
14．—What languages ______ in that country?
—German and English.
A．are speaking B．is spoken C．speak D．are spoken
15．—Do you know what the word “cool” means?
—Of course. It _______ by young people so often these days.
A．uses B．is used C．is using D．was used
16．Students __________________ not to use mobile phones in our school now.
A．ask B．asked C．are asked D．were asked
17． to have the meeting .
A．If; isn't decided B．When; hasn't decided
C．Whether; isn't decided D．How; hasn't decided
18．A year has four seasons and it ________ twelve star signs.
A．divided into B．is dividing into
C．divides into D．is divided into
19．We _______ spend too much time in watching TV.
A．told don't B．told not to
C．are told not to D．was told to not
20．New computers ________ in our school.
A．are using B．is used C．are used D．have use
21．The relationship between China and the USA is always _______.
A．paid attention B．pay attention to
C．paid attention to D．paying attention
22．It's a custom in China to have some tea or other drinks before the meal .
A．serves B．served C．is served D．will be served
23．Smoking in the hospital, please stop .
A．is allowed; smoking B．allows; to smoke
C．isn't allowed; to smoke D．isn't allowed; smoking
24．Forbidden City ______ all over the world.
A．knows B．famous C．is known D．was known
25．Twelve-year-olds ______ to have jobs in our country.
A．is not allowed B．are allowed
C．is allowed D．are not allowed
26．Don't worry. All the children __________ by the nurses.
A．are well taken care of B．take good care of
C．are taken good care D．take good care
27．—Who is the most well-known writer in China?
—Mo Yan_________to be the best. He has won the Nobel Prize.
A．thinks B．thought C．is thought D．has thought
28．Get in now before it _____________ out.
A．sell B．sells C．is selling D．is sold
29．— Waiter, I'd like some dumplings.
— Sorry, sir. Dumplings _________________ only for lunch and dinner.
A．serve B．served C．are served D．are serving
30．Nowadays China for its new "four great inventions"—shared bicycles, electronic payment, high-speed railways and online shopping.
A．was knowing B．was known C．is knowing D．is known
31． ________of the relaxing time for Chinese people every day ________in watching TV.
A．Two thirds; are spent B．Two thirds; is spent
C．Two third; are spent D．Two third; is spent
32．The good friends got when they went to different colleges．
A．part B．separate C．separated D．separating
33．The sign on the right tells us taking photos here.
A．allowed B．isn't allowed C．are allowed
34．Smartphones _________________in the classroom.
A．aren't allowed B．aren't allowing
C．allow D．is allowed
35．The famous writer's new book ________________ out. How popular it is!
A．is selling B．is sold C．was selling D．will be sold
36．In Switzerland, keeping only one goldfish isn't ___________, because the government believes it is very bad to make such social animals live alone.
A．stopped B．doubted C．refused D．allowed
37．To keep our classroom clean and tidy, the floor must every day.
A．sweep B．be sweeping C．be swept D．have swept
38．The new CDs __________so well that they ___________ out in all the shops.
A．are sold; sell B．sell; sell
C．are sold; are sold D．sell; are sold
39．This railway Pudong New Area.
A．connect to B．connected to C．is connected to
40．-- I hear local people are trying to prevent some businesses building factories here.
-- Yes. They say the place may be polluted if some factories _______in the future.
A．are built B．will be built C．build D．will build
41．—Can Mr King spare some time for the charity show?
—If he ___________, he will try his best to make it.
A．will be invited B．is invited
C．invites D．invited
42．Many trees and flowers in our city every year.
A．are planted B．planted C．were planted
43．In some parts of the world, tea ____with milk and sugar.
A．is serving B．is served C．serves D．served
44．— Beijing Opera sounds beautiful.
— So it is, and it by people from throughout the world.
A．is enjoyable B．is enjoyed C．are enjoyed D．enjoys
45．— The clothes on the bed very dirty, Mom. They are smelly.
一Yes, they .
A．can be; should be washed B．must be; should wash
C．can be; should wash D．must be; should be washed
46．Every day, too much water in our school. We should save it.
A．wasted B．wastes C．was wasted D．is wasted
47．— Look at the sign on the right.
— Oh, parking ________________ here.

A．doesn't allow B．isn't allowed C．didn't allowed D．wasn't allowed
48．You'll ______ to join in the party if your homework ______.
A．ask, do B．be asked, is done
C．asked, did D．be asked, will be done
49．The Great Wall _____ all over the world.
A．knows B．knew C．is known D．was known
50．This kind of machine cutting paper.
A．used for B．is using for C．is used for D．used to


答案解析部分
1．A
2．D
3．A
4．A
5．B
6．B
7．C
8．C
9．A
10．A
11．B
12．A
13．B
14．D
15．B
16．C
17．C
18．D
19．C
20．C
21．C
22．C
23．D
24．C
25．D
26．A
27．D
28．D
29．C
30．D
31．B
32．C
33．B
34．A
35．B
36．D
37．C
38．D
39．C
40．A
41．B
42．A
43．B
44．B
45．D
46．D
47．B
48．B
49．C
50．C


初中英语：一般现在时被动语态练习100题
第一部分:1-50 专项练习 第二部分:51-100名师解题

1．Tea is grown drinking. I to drink four times a day
A．for; am asked B．to; was asked C．as; ask D．by; asked
全面解析：茶被种植是为了喝。我被要求一天喝四次。for：为了，to：向，by: 通过，as：作为，我和要求是被动关系，根据句意可知时态是一般现在时，故选A。
2．—My grandpa has a small garden. He always keeps it _______.
—Oh! I know. It's said that it ________ every day.
A．cleaning; is cleaned B．cleaned; has cleaned
C．clean; is cleaning D．clean; is cleaned
全面解析：—我爷爷有一个小花园，他总是使它保持干净。—哦，我知道，据说她每天被打扫。clean adj干净的；vt打扫。第一空属于短语：keep+宾语+形容词，保持某物处于某种状态，所以用clean；第二空是that引导的从句的谓语，it与动词clean构成被动关系，故用被动语态is cleaned，故答案为D。

3．How many trees ______ every year?
A．are planted B．will plant
C．have been planted D．planted
全面解析：每年种多少树？树木和种植之间是被动关系，根据every year，可知句子是一般现在时的被动语态，be done，故选A。

4．—Don't smoke here, Dad. Smoking ___________in public places.
—Oh, sorry. I'll stop right now.
A．isn't allowed B．aren't allowed C．doesn't allow D．not allows
全面解析：——不要在这里吸烟，爸爸。在公共场合不允许吸烟。——噢，抱歉，现在我马上停止。 Don't smoke here, Dad. 可知此处禁止吸烟。句子的主谓之间是被动关系，用被动语态，一般现在时的被动语态is/am/are+done，主语是第三人称单数，系动词用is，故选A。

5．—Is the kite ________ now?
—Yes, we can fly it this afternoon.
A．do B．done C．doing D．does
全面解析：——现在风筝做好了吗？——是的，我们今天下午可以放飞。根据题干及选择项的提示可知此句询问的是风筝做好了吗？the kite作主语，谓语动词要用被动语态，动词的过去分词，故选B。

6．With the development of China, Chinese _________________by a large number of people in the world.
A．speaks B．is spoken C．speak D．is speaking
全面解析：随着中国的发展，汉语被世界上许多人说。A.说，一般现在时；B.被说，一般现在时的被动语态；C.说，一般现在时；D.正在说，现在进行时。主语Chinese是动作speak的承受者，时态是一般现在时，所以用一般现在时的被动语态，结构是be+动词过去分词，主语Chinese是不可数名词，所以用is，speak的过去分词是spoken，故选B。

7．Today we are still influenced ________________ his thoughts.
A．in B．of C．by D．with
全面解析：今天我们仍然受他思想的影响。A.在……里面；B. ……的……；C.由；D.和。be+动词过去分词+by，表示被动语态，are influenced是被动语态，所以用by，故选C。

8．Sanya ___________ to be a good place for travelling today.
A．knows B．knew C．is well-known D．was well-known
全面解析：现在作为一个旅游的好地方三亚是很有名的。know知道，动词；well-known众所周知的，形容词，根据today可知句子是一般现在时，句子是系表结构，故选C。

9．Since your homework ____________ , you can go skiing with Nick.
A．is done B．will do C．will be done D．has done
全面解析：因为你的作业做完了。你可以和尼克去滑雪。主语与动词之间是被动关系，A，is done一般现在时的被动语态.B，will do一般将来时C，will be done一般将来时的被动语态。D，has done现在完成时。用被动语态，根据句意，本题用一般现在时。故选A。

10．—Claudia, are you going to Mike's birthday party on Sunday?
—Unless I ____________.
A．am invited B．invited C．was inviting D．invited
全面解析：——克劳迪娅，你星期天要去迈克的生日聚会吗？——除非我被邀请。invite，邀请，动词原形。结合题干中的语句 ——are you going to Mike's birthday party on Sunday?—Unless I…可知invite与主语I存在动宾关系，谓语动词要用被动语态。B，C与D都是主动语态，故选A。

11．— Have you finished your report on green life?
— Not yet. I'll make it if I _________________ another two days.
A．give B．am given C．will give D．will be given
全面解析：——你已经完成关于绿色生活的报道了吗？——还没有，如果再给我两天，我会完成它。A.给，一般现在时；B.被给，一般现在时的被动语态；C.将给，一般将来时；D.将被给，一般将来时的被动语态。主语I 是动作give的承受着，所以用被动语态，if引导的条件状语从句，从句用一般现在时，所以用一般现在时的被动语态，结构是be+动词过去分词，主语是I，所以be用am，give的过去分词是given，故选B。

12．FIFA World Cup every four years.
A．is held B．was held C．will be held
全面解析：国际足联世界杯每四年举行一次。根据every four years可知此句要用一般现在时。谓语动词hold与主语FIFA World Cup存在动宾关系，所以要用被动语态，故选A。

13．A lot of things ________ in Oxfam shops, _________ books.
A．sell; including B．are sold; including
C．sell; include D．are sold; include
全面解析：在乐施会商店出售很多东西，包括书籍。A lot of things是sell这一动作的承受者，该用被动语态。including是一个介词，包括。所以选B。

14．—What languages ______ in that country?
—German and English.
A．are speaking B．is spoken C．speak D．are spoken
全面解析：——在那个国家讲哪种语言？——德语和英语。描述客观事实用一般现在时，语言被讲，动词speak与主语languages之间是被动关系，故用被动语态，基本动词形式是be spoken，主语是名词复数languages，根据主谓一致原则，故谓语应是are spoken，故选D。

15．—Do you know what the word “cool” means?
—Of course. It _______ by young people so often these days.
A．uses B．is used C．is using D．was used
全面解析：——你知道单词“cool”什么意思吗？——当然，近日年轻人经常用它。主语it是动作use的承受者，时态是一般现在时，所以用一般现在时的被动语态，结构是am/is/are+动词过去分词，主语it是单数，所以用is，use的过去分词是used，故选B。

16．Students __________________ not to use mobile phones in our school now.
A．ask B．asked C．are asked D．were asked
全面解析：现在我们学校要求学生不要使用手机。根据now可知，此句是一般现在时，且主语students和谓语动词ask是动宾关系，用一般现在时的被动语态，结构为“am/is/are done”。故选C。

17． to have the meeting .
A．If; isn't decided B．When; hasn't decided
C．Whether; isn't decided D．How; hasn't decided
全面解析：是否开会还没有被决定。If如果；When何时；Whether是否; How如果。isn't decided一般现在时的被动语态；hasn't decided现在完成时。分析句子可知，本句主语the meeting是动作decide的承受者，所以需用被动语态，排除B和D；又因为if表示“是否”时其后不与to do连用。故选C。

18．A year has four seasons and it ________ twelve star signs.
A．divided into B．is dividing into
C．divides into D．is divided into
全面解析：一年有四季，被分成12个星座。divide sth into把……分成……。it 与divide构成被动关系，故选D。

19．We _______ spend too much time in watching TV.
A．told don't B．told not to
C．are told not to D．was told to not
全面解析：我们被告诉不能花费太多时间看电视。主语we是动作tell的承受者，所以用被动语态，结构是be+动词过去分词，主语是we，所以be用are或者were，tell的过去分词是told，故选C。

20．New computers ________ in our school.
A．are using B．is used C．are used D．have use
全面解析：新电脑在我们学校被使用。主语computers是动作use的承受者，时态是一般现在时，所以用一般现在时的被动语态，结构是am/is/are+动词过去分词，computers是复数，所以用are，use的过去分词是used，故选C。

21．The relationship between China and the USA is always _______.
A．paid attention B．pay attention to
C．paid attention to D．paying attention
全面解析： 中国和美国之间的关系总是受关注。 中美两国的关系作为一个对象，应该是被人们所观注，所以应该用被动语态，也就是动词应该用过去分词形式，paid是pay的过去分词，所pay attention to，固定搭配，注意，故选C。

22．It's a custom in China to have some tea or other drinks before the meal .
A．serves B．served C．is served D．will be served
全面解析：中国的习俗是，在吃饭之前，先喝点茶或其他饮料。主语 the meal 是动作的承受者应用被动语态，又因为在时间状语从句中常用一般现在时态表一般将来时，应用一般现在时的被动语态即：be+pp，故选C。

23．Smoking in the hospital, please stop .
A．is allowed; smoking B．allows; to smoke
C．isn't allowed; to smoke D．isn't allowed; smoking
全面解析：吸烟在医院是不允许的，请不要吸烟。第一空smoking与allow之间构成被动关系，故用被动语态的否定式isn't allowed。stop doing sth停止做某事，故选D。

24．Forbidden City ______ all over the world.
A．knows B．famous C．is known D．was known
全面解析：紫禁城闻名世界。描述客观事实用一般现在时，紫禁城被知道，因此know和 Forbidden City之间是被动关系，用被动语态，主语是名词单数，根据主谓一致，故谓语应是is known，故选C。

25．Twelve-year-olds ______ to have jobs in our country.
A．is not allowed B．are allowed
C．is allowed D．are not allowed
全面解析：在我们国家12岁的人不被允许有工作。此句要用一般现在时的被动语态，要用 be done 形式表示被动，主语 Twelve-year-olds 是复数，be 动词要用 are，且根据常识可知应该不允许，要用否定句，直接在 be 动词 are 加上 not，故选D。

26．Don't worry. All the children __________ by the nurses.
A．are well taken care of B．take good care of
C．are taken good care D．take good care
全面解析：别担心。所有的孩子都被护士照顾得很好。 take good care保重，珍重，可以直接使用，不及物动词，其后不用加任何名词，动名词，不能用被动语态；take good care of=take care of...well，照顾好，相当于及物动词，后面要加名词，动名词，作宾语；故排除选项C/D；根据句子结构All thechildren __________ by the nurses. 可知要用被动语态，be+过去分词，故排除选项B，故选A。

27．—Who is the most well-known writer in China?
—Mo Yan_________to be the best. He has won the Nobel Prize.
A．thinks B．thought C．is thought D．has thought
全面解析：——谁是中国最出名的作家？——莫言被认为是最出名的，他获得了诺贝尔奖。根据题干可知，该句是对现在情况的描述，则应用一般现在时。其次，主语莫言和谓语动词think是被动关系，表示被认为，则此处应用一般现在时的被动语态，其结构是主语+is/am/are done。故选D。

28．Get in now before it _____________ out.
A．sell B．sells C．is selling D．is sold
全面解析：在卖完之前把它买下来。It和sell是被动关系，用被动语态。故选D。

29．— Waiter, I'd like some dumplings.
— Sorry, sir. Dumplings _________________ only for lunch and dinner.
A．serve B．served C．are served D．are serving
全面解析：——服务员，我想要一些饺子。——对不起，先生，饺子仅在午饭和晚饭时间提供。A.提供，一般现在时；B.提供，一般过去时；C.被提供，一般现在时的被动语态；D.正在提供，现在进行时。主语dumplings是动作serve的承受着，时态是一般现在时，所以用一般现在时的被动语态，结构是be+动词过去分词，主语dumplings是复数，所以be用are，serve的过去分词是served，故选C。

30．Nowadays China for its new "four great inventions"—shared bicycles, electronic payment, high-speed railways and online shopping.
A．was knowing B．was known C．is knowing D．is known
全面解析：现在中国因为新的“四大发明”——共享单车，电子支付，高铁和网购而出名。主语和谓语之间是被动结构，这是客观事实，句子时态是一般现在时，此处是一般现在时的被动语态。be known for，因为……而出名，固定短语，故选D。

31． ________of the relaxing time for Chinese people every day ________in watching TV.
A．Two thirds; are spent B．Two thirds; is spent
C．Two third; are spent D．Two third; is spent
全面解析：中国人每天有2/3的休闲时间花在看电视上。英语中分数的表达为：分子用基数词，分母用序数词，当分子大于1时，序数词应加s。由于本句主语是“time（时间）”，是动作的承受者，应用被动语态，故选B。

32．The good friends got when they went to different colleges．
A．part B．separate C．separated D．separating
全面解析：当好朋友去上不同大学时，他们就分开了。考查词组 分开，分别，get separated. 故选C.

33．The sign on the right tells us taking photos here.
A．allowed B．isn't allowed C．are allowed
全面解析：右边的那个标志告诉我们拍照在这里是……。根据句意可知用被动语态，且主语taking photos，是单数，因此选B。

34．Smartphones _________________in the classroom.
A．aren't allowed B．aren't allowing
C．allow D．is allowed
全面解析：在教室里不允许使用智能手机。A.不被允许，一般现在时的被动语态；B.不正在允许，现在进行时；C.允许，一般现在时；D.被允许，一般现在时的被动语态。主语smartphones是动作allow的承受者，时态是一般现在时，所以用一般现在时的被动语态，结构是be+动词过去分词，主语是复数smartphones，所以be用are，allow的过去分词是allowed，故选A。

35．The famous writer's new book ________________ out. How popular it is!
A．is selling B．is sold C．was selling D．will be sold
全面解析：这位著名作家的新书卖完了。多受欢迎啊！根据主语book与sell之间是被动关系，要用被动语态，且下句中的连系动词is，可知要用一般现在时的被动语态be+过去分词，主语book，单数，要用is，sell的过去分词sold。故选B。

36．In Switzerland, keeping only one goldfish isn't ___________, because the government believes it is very bad to make such social animals live alone.
A．stopped B．doubted C．refused D．allowed
全面解析：在瑞士，只养一条金鱼是不被允许的，因为政府认为让这种群居动物独居是非常不好的。A： stopped停止。B： doubted怀疑。C： refused拒绝。D： allowed允许。根据句意，because the government believes it is very bad to make such social animals live alone。可知只养一条金鱼是不被政府允许的，只有D： allowed允许符合题意。故选D。

37．To keep our classroom clean and tidy, the floor must every day.
A．sweep B．be sweeping C．be swept D．have swept
全面解析：为了保持教室干净整洁，每天都要打扫地板。sweep，打扫，动词。句子主语是the floor，表示地板必须被打扫，是被动语态，结合情态动词must，所以用must be+过去分词，故选C。

38．The new CDs __________so well that they ___________ out in all the shops.
A．are sold; sell B．sell; sell
C．are sold; are sold D．sell; are sold
全面解析： 新光盘卖得很好，所有的商店都卖完了。 sell作不及物动词时的意思是“卖得”，作及物动词时的意思是“销售”。第一空表示卖得好，是不及物动词，没有被动语态，用主动语态，主语CDs是复数名词，谓语动词用动词原形sell；第二空表示被卖完了，用一般现在时的被动语态，结构为“am/is/are done”。故选D。

39．This railway Pudong New Area.
A．connect to B．connected to C．is connected to
全面解析：这条铁路与浦东新区相连接。铁路应是被连接，被动结构是be done，故选C。

40．-- I hear local people are trying to prevent some businesses building factories here.
-- Yes. They say the place may be polluted if some factories _______in the future.
A．are built B．will be built C．build D．will build
全面解析：－我听说当地的人们在努力阻止一些公司在当地建工厂。－是的, 他们说如果未来建了一些工厂, 这个地方可能会被污染。A. are built一般现在时态的被动语态；B. will be built一般将来时态的被动语态；C. build一般现在时态的主动语态；D. will build一般将来时态的主动语态。主语factories是谓语动词build的承受者, 句子用被动语态；if引出的条件状语从句, 要用一般现在时态表示将来。故选A。

41．—Can Mr King spare some time for the charity show?
—If he ___________, he will try his best to make it.
A．will be invited B．is invited
C．invites D．invited
全面解析：——金先生能抽出一些时间参加慈善演出吗？——如果他被邀请，他会尽全力去做。if引导时间状语从句，时态是主将从现，故此处是一般现在时，主语he和invite是被动关系，故是be done的动词形式，主语是he，be动词用is，故选B。

42．Many trees and flowers in our city every year.
A．are planted B．planted C．were planted
全面解析：在我们这座城市每年有很多树和花……。根据句意可知此处是“被种植”，是被动语态，由时间词every year可知是一般现在时，故选A。

43．In some parts of the world, tea ____with milk and sugar.
A．is serving B．is served C．serves D．served
全面解析：在世界上许多地方，茶随带着牛奶和糖被提供。serve，服务，供应，茶被提供，用被动语态，be served，故选B。

44．— Beijing Opera sounds beautiful.
— So it is, and it by people from throughout the world.
A．is enjoyable B．is enjoyed C．are enjoyed D．enjoys
全面解析：——京剧听起来很美。——是的，它受到全世界人的喜欢。根据by可知考查一般现在时的被动语态，故选B。

45．— The clothes on the bed very dirty, Mom. They are smelly.
一Yes, they .
A．can be; should be washed B．must be; should wash
C．can be; should wash D．must be; should be washed
全面解析：——妈妈，在床上的那些衣服一定很脏，它们有臭味了。——是的，它们该洗了。抓住关键词“smelly有臭味的”可推测出那些衣服肯定是很脏。回答的句子中抓住关键词“yes”，由此可知它们确实很脏，该洗了。故选D。

46．Every day, too much water in our school. We should save it.
A．wasted B．wastes C．was wasted D．is wasted
全面解析：每天，我们学校浪费了太多的水。我们应该保存它。A一般过去时，B一般现在时，C一般过去时被动语态，D一般现在时被动语态，every day，每天，是一般现在时标志，主语water，水，和谓语动词waste，浪费，是被动关系，故用一般现在时被动语态，故选D。

47．— Look at the sign on the right.
— Oh, parking ________________ here.

A．doesn't allow B．isn't allowed C．didn't allowed D．wasn't allowed
全面解析：——看看右边的标志。——哦，在这停车不被允许。A.不允许；B.不被允许；C.不允许；D.不被允许。主语parking是动作allow的承受者，时态是一般现在时，所以用一般现在时的被动语态，结构是be+动词过去分词，主语是parking，所以be用is，allow的过去分词是allowed，故选B。

48．You'll ______ to join in the party if your homework ______.
A．ask, do B．be asked, is done
C．asked, did D．be asked, will be done
全面解析：如果你的作业做完了你会被邀请参加聚会。if从句用一般现在时表示将来，本句中you和ask构成被动关系，homework与do构成被动关系，因此选B。

49．The Great Wall _____ all over the world.
A．knows B．knew C．is known D．was known
全面解析：长城全世界闻名。be known被知道；闻名。陈述事实，用一般现在时，故选C。

50．This kind of machine cutting paper.
A．used for B．is using for C．is used for D．used to
全面解析：这种机器是用来切纸的。be used for doing 被用来做某事；used to do过去常常做某事。根据句意可知，答案为C。