Not having work out the problem, leave the office．
#63683
A
so he was not allowed to
B
and he didn’t want to
C
the teacher couldn’t make him
D
he couldn’t free himself to
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—Must I go there right now, mum?—No, you ____. You can go there tomorrow.
#75563
A
shouldn’t
B
can’t
C
mustn’t
D
needn’t
--Can I play computer now? --No, you ______. You _____do your homework first.
#76207
A
can; can
B
can’t; must
C
can’t; can
D
must; can
--Is the man standing outside the teacher’s office Mr. Zhou? --No, it ______ be him. He has gone to Hong Kong for an academic conference.
#78290
A
mustn’t
B
can’t
C
needn’t
D
couldn’t