The room is in a terrible mess; it        have been cleaned.
#63332
A
mustn’t
B
can’t
C
shouldn’t
D
wouldn’t
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Look at the sign! It says: You______ park your cars here.
#74232
A
mustn’t
B
needn’t
C
shouldn’t
D
can’t
 “Not having returned home yet, _________”, his father said to the police.
#63543
A
his mother got worried
B
his mother must be worried
C
I think he is missing
D
he must have got into some trouble.