— I am going to the dentist at 4 o'clock and it is 3:30 now.— Well, if you ______ leave earlier today, please ask the director for permission.
#63360
A
can
B
may
C
must
D
will
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The motorbike _____ start, no matter how hard he tried.
#62786
A
shouldn’t
B
couldn’t
C
wouldn’t
D
mightn’t
—I think the man over there must be Bob. -- It_______ be him. He has______ to Australia. 
#78073
A
can’t, gone
B
can’t, been
C
may not, been
D
mustn’t, gone