---Someone is knocking at the door. Who may it be? ---It ______ be Tom. He is still in the school.
#74601
A
can’t
B
mustn’t
C
couldn’t
D
may not
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You ________ in person; a telephone would have been enough.
#62596
A
couldn’t have come
B
needn’t have come
C
shouldn’t have come
D
mustn’t have come
—I can’t stop smoking, doctor.— For your health, I’m afraid you________.
#77297
A
must
B
have to
C
will
D
can
If you have finished most of the work, you ______ start working so early tomorrow.
#77689
A
can’t
B
mustn’t
C
couldn’t
D
needn’t
— Mum, would you please buy me an MP5 player? — If you can help do some housework the whole vacation，you _______ have one as a reward.
#63558
A
should
B
need
C
would
D
shall