单项选择题

() is a good form of exercise for both young and old.

A.Walking
B.To walk
C.The walk
D.Walk

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单项选择题

I know he wasn't listening to me, but I went on, hoping to get him () in the story (故事,新闻报道).

A.interesting
B.interest
C.interested
D.interests

单项选择题

() Smith could find a job, he could hardly support his family with the low pay.

A.Since
B.As
C.Once
D.Even if

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