一、说明下列句中情态动词的含义。(A.能力;B.许可;C.猜测)。
l. “You must write more neatly,” said the teacher.
2. He’s not in the office.He must have gone to the meeting.
3. Visitors mustn’t move and touch the exhibits.
4. The girl can play the violin very well.
5. Can I smoke here?
二、用can(could)，may(might)，must填充。
1. When I was young，I_____ run very fast.
2. What _____ I do for you，Li Hat?
3. I wonder where Ann is.She _________ be with Dick，I think.
4. A：That pen _______ be his.
B：No，it _______(not)be his.
5. Could I use your phone?Yes，of course you _________.