10.Don't play with the dog, Jack, for it ________ be dangerous at times.

　　答案　can

　　二、根据所提供的情景，用适当的情态动词完成句子。

　　1.You ________ (drive) if you are drunk, first because it's dangerous and second because it's against the law.

　　答案　can't/mustn't drive

　　2.As it turned out to be a small party, we ________ (not dress) up so formally.

　　答案　needn't have dressed

　　3.How ________ I help them to understand when they won't listen to me？

　　答案　can

　　4.Don't you think it essential that every person of Brazil ________ spare no effort to make contributions to the 2017 FIFA World Cup？

　　答案　should

　　5.She ________ comb her hair at the table, even though she knows I don't like it.

　　答案　will

　　6.—She looks very happy. She ________ (pass) the exam.

　　—I guess so. It's not difficult after all.

　　答案　must have passed

　　7.—________the new housemaid cook some supper for you, Tom？

　　—No, tell her I'll eat outside tonight.

　　答案　Shall

　　8.—Who has broken the window in my room？

　　—Who else ________ have done it but your naughty son！

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