单项选择题

() on a clear day far from the city crowds, the mountains give him a sense of peace.

A.If walking
B.While walking
C.Walking
D.When one is walking

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单项选择题
It will be difficult to dissuade him now that he () his mind.

A.is making up
B.made up
C.is to make up
D.has made up
单项选择题
The police warned the residents in the area to keep their doors and windows () at night.

A.closed
B.closing
C.to close
D.to be closed
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