一、
1. A
2. D
3. B
4. D
5. C
6. D
7. A
8. B
9. B
10.B
11.D
12.A
13.D
14.B
15.D
二、
1. needn't can
2. must
3. can't
4. can't
5. can
6. must
7. can't
8. must
9. have to
10. needn't
三、
1. Yes, I can.
2. What can do
3. I can't
4. Yes, you must
5. had to
6. What do have to
7. you needn't
8. Does have to
9. Must I finish the work today?
10.You don't have to go to the meeting.
四、
1. plays —— play
2. has to —— have to
3. don't have to —— mustn't
4. have to —— has to
5. mustn't —— needn't
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