-The terrible accident might not have happened had the driver been more careful. --But he _____.
#86997
A
wasn’t
B
didn’t
C
hadn’t
D
doesn’t
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It's dark, Mum ___ be waiting for my return.
#89027
A
can
B
should
C
must
D
may
Without electricity human life _____ quite different today.  
#87207
A
is
B
will be
C
would have been
D
would be
—What happened to the young trees we planted last week?—The trees _      well, but I_        them.  
#86829
A
might grow; hadn't watered
B
needn't have grown; didn't water
C
would have grown; didn't water
D
would grow; hadn't watered