1. This does not mean that we have to write or call our friends every day.It does mean，however，that we care enough about our friends to find out how they are doing from time to time.
答案 should
2. I was really happy to be writing a detective story.But after the first few pages，I just write any more.
解析 考查情态动词。写了几页之后，我就再也写不出来了。此处表达过去的能力。
答案 couldn't
3. I'm Captain John Blanchard.You be Miss Hollis.I am glad to meet you here.
解析 考查情态动词。你一定是Hollis女士。根据语境可知此处要用must表示肯定推测。
答案 must
4. He walked in as if he (buy) the school，and the word quickly got around that he was from New York City.
解析 考查虚拟语气。在人称代词he后，显然是作谓语；又因他不可能是买下了这个学校，故应用虚拟语气，与过去事实相反，故填had bought。
答案 had bought
5. I recommend that you (try) Baihe.com.
解析 考查虚拟语气。recommend, suggest, request, command等后面的宾语从句使用虚拟语气，即should ＋动词原形，should可省略。
答案 (should) try
6. Tom：Sandy.It seems that only half of the students passed the final exam.
Sandy：Really? The exam have been very difficult this time.
解析 考查情态动词。答句意为“这次的考试一定很难”。must have done肯定……，表示对过去的肯定猜测。
答案 must
7. It's a pity you were late，otherwise you (see) the film star Rain from Korea.
解析 考查虚拟语气。根据otherwise判断此处是含蓄型的虚拟语气，表示对过去的虚拟时，主句用would have done。
答案 would have seen
8. All the students put on masks before going to school in case they are infected with flu virus.
解析 考查情态动词。所有学生应在去学校之前带上口罩以防感染禽流感。shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁。
答案 shall
9. Had the government limited the sales of cars much earlier，traffic jam and pollution not be so serious now.
答案 would
10. If you will stay here longer，you may.But you leave before this weekend.
解析 考查情态动词。根据but可知，此处强调说话人主观上认为“必须”做某事，要求对方必须在周末前离开。must必须。
答案 must
11. He commanded that all the gates (shut) when it was getting dark in case thieves came in.
解析 考查虚拟语气。他要求天黑时关闭所有的门以防小偷进入。command 表示“命令，要求”后跟宾语从句时用虚拟语气should do sth，其中should 可以省略。
答案 (should)be shut
12. Tom：Did you visit the famous cultural relics last month?
Mary：No，we (visit) it，but we spent too much time shopping.
解析 考查情态动词。我们“本能够”去的，但是我们花太多时间购物，所以没能去。could have done本能够做某事(但没做成)。
答案 could have visited
13.It is necessary that the government (find) solutions for the problems of air pollution to create a clear environment.
解析 考查虚拟语气。在句型“it is necessary＋ that从句”中，谓语动词应该用should ＋
动词原形，should可以省略。
答案 (should) find
14. It has been suggested the sports meeting (put) off till the smog is not so severe.
解析 考查虚拟语气。在 “It is suggested that ＋从句”中谓语动词应该用should＋动词原形，should可以省略，根据句意应该用被动形式。
答案 (should) be put
15.And a similar number of students believe that a good university produce graduates who are particularly sought after by employers.
解析 考查情态动词。句意：同样数量的学生认为一个好的大学应该培养雇主们追求的毕业生。should应该，应当，表示义务、责任，符合语境。
答案 should
16. Curiosity sometimes be foolish or wrong.Some people with nothing to do are full of curiosity about what their neighbors are doing.
答案 can
17. you please help me get him back into his wheelchair?
解析 考查情态动词。句意：你可以帮助我将他弄回到轮椅上吗？Would you please...？请你……好吗？表示婉转的请求。
答案 Would
18.Columbus could never have found America if he (not be) curious.
解析 考查虚拟语气。句意：哥伦布如果不曾好奇，就不会发现美洲大陆。对过去的虚拟，从句要用过去完成时，主句要用could/should/might/would ＋ have done结构。
答案 had not been
19. Joseph Addison once said，“Reading is to the mind what exercise is to the body.” I am sure you have heard this quote.
解析 考查情态动词。句意：我确定你一定或可能听过这句话。情态动词表推测可用must/may/might/can/could。
答案 must/may/might/can/could
20.Only by pursuing our dreams we enjoy a meaningful and fulfilled life.
解析 考查情态动词。句意：只有追求梦想我们才能享受有意义的完整人生。only修饰状语放在句首要使用倒装句，can要提到主语前面。
答案 can
21. The tone of the letter should be personal，as if you speaking face to face to the donor.
解析 考查虚拟语气。句意：写信的语气要亲切，好像你们在面对面交谈。这里as if后要用一般过去时表示虚拟语气。
答案 were
22.Therefore，when you are going on a trip，you make a good preparation.Firstly，you must have clear information about the weather.
解析 考查情态动词。所以，每次旅行都应该或必须做好充分的准备。
答案 should/must
23. Every time she was in trouble，she went to him for help，as he said he do anything for her.
答案 would
24. Actually，if Van Gogh (die) at the age of twenty，no one would have connected him with failure or mental illness.Instead he would have been remembered by those close to him as a dutiful son.
解析 考查虚拟语气。根据主句谓语动词可以看出是对过去的虚拟，所以从句用had died。
答案 had died
25. Seeing the girl in green walk quickly away，John felt as if he (split) in two.
解析 考查虚拟语气。他感觉好像被分成了两半。as if后面用虚拟语气(were split)表示不是客观事实。
答案 were split
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