(2013·河南省普通高中适应性检测卷一)People spend many years learning about favorite sports and ________ how to do them well.
#88992
A
practice
B
practiced
C
practicing
D
to practice
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 In the USA, he made a lot of friends ______ English well to make himself ______.
#97969
A
learn; understand  
B
to learn; understood
C
learning; understand
D
learned; understood
They are broading the bridge to _____the flow of traffic.
#89920
A
put off
B
speed up
C
turn on
D
work out