單項(xiàng)選擇題(),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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A.painted;topaint
B.ispainting;painting
C.paint;topaint
D.have painted;to paint

2.單項(xiàng)選擇題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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A.kind
B.type
C.sort
D.category

4.單項(xiàng)選擇題Let's not wait any longer, he might not()at all.

A.turn over
B.turn up
C.turn on
D.turn down

5.單項(xiàng)選擇題One day while Mr. King was working, he had a(an)()and his left leg was badly injured.

A.business
B.accident
C.matter
D.event

7.單項(xiàng)選擇題I am pleased to take()to exchange views with you.

A.this opportunity
B.a chance
C.this time
D.aperiod

8.單項(xiàng)選擇題Please leave the key under the door()you go out.

A.in case
B.in the case
C.in case of
D.in the case of

10.單項(xiàng)選擇題It()that I met one of my old classmates on my way home yesterday.

A.took place
B.occurred
C.broke out
D.happened