单项选择题

The ratio of the work done by the machine（）the work done on it is called the efficiency of the machine.

A、 against
B 、with
C、 to
D、 for

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单项选择题

The work they are doing is（）great value.

A.in
B.of
C.by
D.from

单项选择题

She moved away from her parents, and missed them（）enjoy the exciting life in New York.

A、 too much to
B、enough to
C、 very much to
D、 so much to

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