单项选择题

At no time ______ what was happening.

A．the President was aware of
B．the President was aware about
C．was the President aware of
D．was the President aware on
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单项选择题
Every director needs an assistant that he can ______ to take care of problems that may occur in his absence.
A．count on
B．count for
C．count down
D．count out
单项选择题
Is this the knife ______
A．for which you are looking
B．for that you are looking
C．which you are looking for
D．that you are looking
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