1. Mary _______ be at home. I saw her in the library just now.
A. mustn’t
B. needn’t
C. shouldn’t
D. can’t
正确答案：D
2. 8. When ______, water will change into vapor.
A. heat
B. heating
C. heated
D. to heating
正确答案：C
3. —Are you doing anything special on Friday, Bill? —_______ —Oh, what a pity!
A. No, nothing special
B. Yes, I have promised to call on some friends
C. Yes, of course
D. No, I’m not sure. Why?
正确答案：B
4. Tom is the boy _______, everyone thinks, will win the first prize.
A. who
B. whom
C. whoever
D. he
正确答案：A
5. —What’s the time by your watch? —_______
A. It’s half past five.
B. It’s Sunday.
C. It’s February.
D. It’s a fine day.
正确答案：A
6. —Must I stay here for hours? —No, you _______, You can leave any time.
A. mustn’t
B. needn’t
C. can’t
D. wouldn’t
正确答案：B