4．You ________ leave your key at the reception desk.

　　5．A computer can't think itself.It ________ be told what to do.

　　6．The question comes down to whether we ________ act upon his advice.

　　7．Hurry up！He ________ be waiting for us anxiously right now.

　　8．My MP5 has disappeared.Who ________ have taken it?

　　9．—Where is Bob?

　　—He ________ be in the living room，but I am not sure.

　　10．You ________ not have told her the terrible news.She is very upset right now.

　　11．They are playing basketball；they ________ have finished their homework.

　　12．I saw him just now so he ________ not have gone abroad.

　　13．It's surprising that such a gentleman ________ be so rude to the old.

　　14．—May I watch TV after supper?

　　—No，you ________．

　　15．You look tired，so you ________ as well go and have a rest.

　　【答案】　1.May　2.Would　3.Shall　4.may/can　5.must　6.ought to/should　7.must　8.can/could

　　9．may/might/could　10.should　11.must

　　12．could　13.should　14.mustn't　15.may/might

　　Ⅱ.根据所提供的情景，用适当的情态动词完成句子

　　1．Marie called me up last night but I didn't hear it.I ________________________ asleep.

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