— The terrible accident is under investigation.— Actually, quicker action _____ those workers trapped in the mine.
#87562
A
might have saved
B
must have saved
C
should have saved
D
could have saved
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----I failed again. I wish I _________ harder.---But you _________.
#86994
A
had worked; hadn’t
B
worked; didn’t
C
worked; don’t 
D
had worked; didn’t
 It was ordered that all the soldiers ____ to the front.
#87922
A
should send
B
must be sent
C
be sent
D
must go