He ______ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
#62659
A
wouldn’t
B
shouldn’t
C
couldn’t
D
mustn’t
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They       have got lost, or had an accident.
#62726
A
can
B
might
C
must
D
mustn’t
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