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题型：单选题题类：常考题难易度：普通

I think walking is________our health.

A、good at B、bad at C、well in D、good for

举一反三

People _______ our support and help . We must do something at once.

—Excuse me, Maria. Can I use your bike?
—Sure. Here you are. But you must return it _____ time.

The writer will let me have a copy of his new book as soon as it .

— I heard that there were few trees on the mountain behind your village.

— It used to be. But ________ trees were planted last month.

Why not let ________ help you?

— Excuse me. Where is the nearest bookstore?

— Go ___________________ Center Street and you'll find it.

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