It was ___________ (care) of him to leave the door unlocked when nobody was in.
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Children should be taught how to ___________ (behavior) themselves.
There whole city was ___________ (total) destroyed in the earthquake.
I’m sorry; your answer is ____________ (correct).
Mary was always speaking highly of her role in the play, ____of course, made the others unhappy.
A. that
B. what
C. who
D. which