--Who’s the man over there?Is it Mr Black?----It _____be him.He’s much taller.
#75687
A
mustn’t
B
can’t
C
should
D
may
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The river smells terrible. People_______ dirty things into it .
#63313
A
must stop to throw
B
must stop from throwing
C
must be stopped to throw
D
must be stopped from throwing
As it turned out to be a problem of no importance , we     so much time looking into it . 
#62607
A
needn’t spend
B
didn’t have to spend
C
needn’t have spent
D
oughtn’t to spend