They demanded that the books ______ to the school library right away.  
#87511
A
should return
B
be returned
C
were returned
D
returned
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I told Sally how to get here, but perhaps I _______ for her. 
#89978
A
had to write it out
B
must have written it out
C
should have written it out
D
ought to write it out
—I failed again. I wish I _________ harder.—But you _________.
#87572
A
had worked; hadn’t
B
worked; don’t
C
had worked; didn’t  
D
worked; didn’t