1. Must I finish my homework today？
No， you _______.
A. cant.
B. neednt.
C. mustnt.
D. may not
2. _______ I speak to Mary？
Mary Speaking.
A. Must
B. Need
C. May
D. Shall
3. This math problem is too har
D. Nobody _______ do it.
A. may not
B. may
C. cant
D. can
4. Can you speak Japanese？
No， I _______.
A. cant
B. mustnt
C. may not
D. neednt
5. You _______ stop when the lights are re
D.
A. may
B. can
C. should
D. must
6. You _______ play football in the street. Its dangerous.
A. cant
B. shouldnt
C. mustnt
D. wouldnt
7. Go and ask Mr Smith. He ______ know her telephone number.
A. Can
B. may
C. need
D. dare
8. He _______ be at home， because the light in his room is on.
A. must
B. can
C. should
D. might
9. Would you like to go swimming with me this afternoon？
Id love to. But Im afraid I _______. I have too much work to do.
A. cant
B. mustnt
C. neednt
D. may not
10. Can you go fishing with me this afternoon？
Sorry， I cant. I _______ stay at home and look after my mother. Because she is ill.
A. can
B. may
C. would
D. have to
11. Could I look at your new computer？
Yes， of course you _______.
A. could
B. can
C. will
D. might
12. You _______ tell him the news； he knows it.
A. neednt
B. dont
C. cant
D. mustnt
13. _______ I come in？ Yes， you _______.
A. May， can
B. Must， neednt
C. must， must
D. May， may
14. _______ yoou pass me a pen？ Id like to write down the telephone number.
A. Need
B. Could
C. Must
D. Should
15. If you teach me English I will _______ speak it well.
A. can
B. may
C. must
D. be able to
【答案详解】
1. B。must提问的否定回答应用neednt，意为不必。
2. C。电话用语May I speak to Mary？其中的may可换用can或could。
3. D。根据句意这道数学题太难了，没人会做，只有can符合题意。
4. A。can提问的否定回答应用cant。意为不能。
5. D。must表命令，意为必须，应该。
6. C。must用于否定句中，表示禁止，不准。
7. B。may 表推测，意为可能
8. A。must表推测，意为准是、一定是，通常只用于肯定句。
9. A。根据语境，只有cant (不能) 最符合题意。mustnt意为一定不要，neednt意为不必。
10. D。have to意为必须，则重于客观需要，含有不得不、被迫之意。
11. B。could提问表示委婉语气，并不是表示过去，所以回答时要用can。
12. A。根据语境和后句意思(he knows it)，所以你不必(neednt)告诉他了。cant意为不能，mustnt意为一定不要。
13. D。表示请求许可常用情态动词may，may提问的肯定回答用may。
14. B。根据语境，选用could，could表比较委婉的请求。
15. D。在助动词之后不能连用情态动词can， may， must，但be able to有多种时态形式，可与will连用，构成将来时态。