单项选择题

（）,we keep records on all the experiments so that we may have enough.

A.As a whole
B.As a rule
C.On the average
D.by all means

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单项选择题
We（）the bathroom and plan（）the bedroom this year.

A.painted;topaint
B.ispainting;painting
C.paint;topaint
D.have painted;to paint
单项选择题
One of the benefits of the new model is that it is easier（）than the old one.

A.operating
B.to be operated
C.to operate
D.operated
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