16.He found it hard to concentrate on his writing ______ so many people around.
A.when
B.during
C.because
D.with
17.When she was five,the girl’s father decided to ______ a pianist of her.
A.develop
B.build
C.make
D.do
18.______ automobile pollution,the air quality in this city has become worse.
A.As a result of
B.In spite of
C.But for
D.As for
19.Her friends did not expect her to ______ all their suggestions.
A.turn down
B.turn over
C.take off D.take away
20.The motor isn’t ______ enough to push the car up the hill.
A.tough
B.powerful
C.strong
D.big
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