Ⅱ.根據(jù)句意，用適當?shù)那閼B(tài)動詞(can/ought to/need/must/have to)的適當形式填空

　　1.One ________ cross the street against the red light.

　　2.His mother is ill, so he________ take care of her.

　　3.—I have to stay at home preparing my lessons.

　　—But you ________ . Tomorrow is Sunday.

　　4.Mike's father is ill, but you ________ tell him, because he is to take an important examination.

　　5.—It ________ be that naughty boy crying outside.

　　—It ________ be him, because he has gone to school.

　　6.— ________ I finish the task right now?

　　—Yes, you________.

　　7.You were out enjoying yourself when you ________ have been studying.

　　8.If you are busy now, you don't ________ come with us.

　　答案：1.ought not to/mustn't　2.has to　3.needn't/don't have to　4.mustn't　5.must;can't　6.Must;must7.ought to　8.have to