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考查情态动词的用法。句意：如果你非得要走的话，至少也要等到这暴风雨过去后。can可以，能够；may 可能，许可；must(表示主张)一定要，坚持要；will将要，愿意。根据后半句的劝告，选C。
If you ______ go, at least wait until the storm is over.
句意：-- 你知道David在哪吗？他不在办公室。-- 噢，他一定没走远，他的大衣还在这里呢。can't have done一定没做过某事，表示对过去情况的否定推测。
— Do you know where David is?He is not in the office.
— Well, he ______ have gone far—his coat's still here.
I ______ use a clock to wake me up because at six o'clock each morning the train comes by my house.
考查情态动词。句意：由于没有人帮他,他一定是独自做的那项研究。由句意可知，此处是对过去事情的肯定推测，因此用“must+have done”结构。can have done用于否定句或疑问句中，表示对过去情况的推测；would have done表示对过去将来情况的推测；need have done表示“本需要做某事却没做”。
Since nobody gave him any help,he ______ have done the research on his own.
It's important to know about the cultural differences that ______ cause problems.
考查情态动词。根据空后面的last night可知，Harry喝酒一事是过去的事情，结合语境可知此处表示对过去的事情的肯定推测，应该用must have done结构。
Harry is feeling uncomfortable.He ______ too much at the party last night.
Just as Jane is doing her homework, ______ you bother her with playing the piano now?
考查情态动词。句意：司机在出车祸前，可能喝太多了，但我不是很确定。从后半句 “but I am not quite sure of that”可知，是对过去发生的事情作不肯定的推测。
The driver ______ have drunk a lot before the accident, but I am not quite sure of that.
— Do you think he'll do me a favor ?
— It's very unlikely,but he ______ be prepared to help you.
What a pity! I ______ in Hong Kong for three more days, but something urgent needed to be handled back home.
考查情态动词表推测的用法。句意：-- 嗨，汤姆，你知道简在哪吗？-- 她一定在教室，我刚才还看见她在那儿。根据语境可知，本题是对现在事实进行肯定推测，要用must be。
— Hi, Tom.Any idea where Jane is?
— She ______ in the classroom.I saw her there just now.
考查情态动词的用法。句意：我靠他们足够地近以听见他们说汉语，而且我会像在中国可能做的那样说“你好”。must“必须”，should“应该”，表示义务或责任；can表示能力，均不合句意。might表示“可能”，符合语境。
I got close enough to hear them speaking Chinese, and I said “Ni Hao”,just as I ______ do in China.
考查情态动词表推测的用法。句意：-- 早上好，我和人事部的Smith小姐有约。-- 啊呀，早上好。那您一定是Peters女士。根据句意可知说话人对所判断的情况很肯定，故选B项。
— Good morning.I've got an appointment with Miss Smith in the Personnel Department.
— Ah,good morning.You ______ be Mrs.Peters.
考查情态动词表推测的用法。句意：-- 你的新保姆怎么样？-- 找不到更好的了。我们的孩子都很喜欢她。should应该；might可能，可以；mustn't禁止；couldn't不可能。表示一种否定的推测，语气不是很肯定。
— How's your new babysitter?
— We ______ ask for a better one.All our kids love her so much.
It is unbelievable that he ______ have bought so large quantities of goods on taobao.com on Double Eleven Day.
考查情态动词的用法。题干的意思是:“我从未玩得更开心过——这是完美的一天。”shouldn't have done表示“本不应该做而事实上已经做了”；needn’t have done表示“本没有必要做而事实上已经做了”；wouldn’t have done用于虚拟语气；couldn’t have done表示“不可能做过”。此处用not和比较级连用表达最高级的含义，意为“从未比这更高兴过”。所以正确选项应是D项。
I ______ myself more -- it was a perfect day.
One of our rules is that every student ______ wear school uniform while at school.
You ______ make mistakes,but that is the way you learn how things work and how to mend them.
考查情态动词的用法。句意：几天后，我哥哥打电话说他一切很好，但不愿意说他在哪儿。mustn't意为“禁止”；shouldn't意为“不应该”；wouldn't意为“不愿意”；mightn't意为“或许不”。
Days later, my brother called to say he was all right, but ______ say where he was.
考查情态动词。句意：孩子们一定是在树林里迷路了；否则，他们会按照计划到达湖边的营地了。根据句意可知，孩子们现在还没有到达，此处表示对过去事情的一种肯定推测，故用“must have done”形式。
The children ______ lost in the woods; otherwise,they would have been at the lakeside camp as scheduled.
— I haven't finished my task yet.
— You shouldn't have watched the film last night, or you ______ it by now.
考查情态动词的用法。句意：给予更多爱和影响的婴儿，当他们长大时可能会更好地处理压力和焦虑。may表示可能性的推测。must“一定”，表示极具把握性的推测，不合句意。
Babies given more love and affection by their mothers ______ deal better with stress and anxiety when they grow up.
考查情态动词表推测的用法。句意：-- 我真不喜欢James。你为何请了他？-- 别担心。他可能来不了。他说他的计划还没安排好。题干中的he wasn't certain说明他可能不来，也可能来，因此此处使用不完全否定might not，表示可能性极小的推测。选D。
— I don't really like James.Why did you invite him?
— Don't worry.He ______ come.He said he wasn't certain what his plans were.
Don't worry. I've just sent an ambulance to you.They ______ be there any second.
Jack described his father, who ______ a brave boy many years ago, as a strong-willed man.
— You needn't take an umbrella.It isn't going to rain.
— Well,I don't know.It ______ do.
考查情态动词表推测。句意：-- Sunny昨天在500人面前做了一个演讲。-- 哇，那么多观众，她一定很紧张。考查对过去事情的肯定推测，用must have done。
— Sunny had to give a speech in front of 500 people yesterday.
— Whew!That's a big audience.She ______ have been nervous.
— Mum, I'm tired.
— Well, if you ______ go to bed after midnight every night, what do you expect?
考查情态动词。句意：-- 这个周六你打算做什么？-- 我不确定，但是我或许会去滚石演唱会。由答语中的“I’m not sure”可知，答话人对自己的安排还不能确定，因此用might，表示“可能，或许”。must表示肯定的推测，意为“必须,一定”；would表示意愿；should表示“应该”。
— What are you doing this Saturday?
— I'm not sure,but I _____ go to the Rolling Stones concert.
— It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
— I can't agree with you more.There ______ be errors for every single step.
考查情态动词。句意：不可能是词汇量导致你难以完成那道练习题,因为你掌握了大量的词汇。根据原因状语从句because you know a lot of words可知，主句应该是否定的，排除A、C。needn't表示“不必”，不符合题意，此处表示对可能性的推测，couldn't 表示“不可能”，故选B。
It ______ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
考查情态动词的用法。句意：既然Suzie不和我们一起吃晚饭，所以我们就不需要买这么多食物。may not不可以，needn’t不需要，can’t不可能，mustn't绝不可能，B项符合句意。
We ______ have bought so much food now that Suzie won't be with us for dinner.
句意：幸运的是，那个人错过了开往温州的高铁，否则他或许会在事故中丧生。根据语境可知本题是推测过去的可能性，但并没有把握，所以用might have done表示(过去)或许会发生。
Luckily the man missed the high-speed train to Wenzhou, or he ______ have been killed in the accident.
句意：-- 一名好老板会是什么样子？-- 很难说。但我认为他应该是有责任心，有决心且具有创造性的。本题考查情态动词。should应该；can能够；may可能，可以；would愿意。
— What is a good boss like?
— It's hard to say,but I think he ______ be responsible,determined and creative.
I still remember my happy childhood when my mother ________ take me to Disneyland at weekends.
Many netizens think there ______ be better ways for the local government to deal with the Internet cafes rather than shut them down.
考查情态动词和think的否定转移。句意：-- 明天下午你会参加聚会吗？-- 我会的，尽管我认为有很多工作要做我不应该去。though表示转折，故选择should表示应该。
— Will you attend the gathering tomorrow afternoon?
— I will, though, with so much work to do,I don't think I ______.
考查情态动词表推测。句意：-- 生日快乐！-- 谢谢你！这是我所能期望的最好的礼物了。A项意为“本应该期望而实际上并非如此”；B项意为“一定希望”；C项意为“也许希望”；D项意为“能够希望”。
— Happy birthday!
— Thank you!It's the best present I ______ for.
句意：-- 你的哥哥找到工作了吗？-- 还没有。有很多他能做的工作，但是他似乎不愿意做任何事情。本题考查情态动词的用法。情态动词could可以表示“现在的能力”，语气较can委婉。
— Has your brother found a job?
— Not yet.There are many jobs that he ______ do but he seems unwilling to do anything
He ______ have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.
考查情态动词。句意：无论她怎么努力去推，这扇门就是打不开。情态动词will表示事物的倾向和特性，意为“总是，会”。从句中用的是一般过去时，因此此处应用will的过去式would。
The door _____ open,no matter how hard she pushed.
考查情态动词。句意：-- 我这些天正想减肥。-- 噢,你一定是疯了。你现在至多50公斤。由下句“You’re 50 kilograms at the most!”可以推断出，此处是肯定的推测，故答案选A项。
— I'm thinking of losing weight these days.
— Oh, you ______ be out of mind.You're 50 kilograms at the most!
句意：-- 很遗憾我在期末考试中没有考第一。-- 振作起来，没有人能够一直赢。can(表示有能力做或能够发生)能，会；should应该，应当；must必须;shall(表示决心、命令或提示)必须，应当。
— I regret to say that I failed to rank first in the terminal exam.
— Come on,nobody ______ win all the time.
