Ⅱ.根据句意，用适当的情态动词(can/ought to/need/must/have to)的适当形式填空
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
