David is clever and quick at work,           he is honoured with the title of model worker.
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A
which
B
where
C
for it
D
for which
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As middle school students, we _____ the police to keep order.
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A
are used to help
B
used to helping
C
used to help
D
used to be helped
It is required that in no case ________ our password.
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A
we should forget
B
should we forget
C
shall we forget
D
we shall forget