--- What kind of house do you want to have? Something big?  --- Well, it         be big --- that’s not important. 
#63616
A
mustn’t
B
needn’t
C
can’t
D
won’t
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John, you          play with the knife, or you          hurt yourself.
#76292
A
won’t; can’t
B
mustn’t; may
C
shouldn’t; must
D
can’t; shouldn’t
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