单项选择题

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
单项选择题
（）ballpoint pen was invented by（）Hungarian refugee named Lazlo Biro.

A.A;a
B.The;a
C.A; the
D.The; the
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