单项选择题

One of the serious problems facing us is（）of how to get enough manpower,

A. that
B. it
C. which
D. what

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There has been a decrease（）the number of students entering the Medical College this year.

A.on
B.over
C.in
D.of
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Are you going to keep me（）all day long

A.to wail
B.wait
C.waiting
D waited
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