Who is the man over there? Is it Mr. Wu? — It ________ him, but I am not quite sure.
#74742
A
may be
B
maybe
C
is
D
must be
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I was really anxious about you. You____ home without a word.
#62986
A
mustn’t leave
B
shouldn’t have left
C
couldn’t have left
D
needn’t leave
Tom, you ________ leave all your clothes on the floor like this next time. 
#63404
A
mustn’t
B
wouldn’t
C
needn’t
D
may not