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题型：单选题题类：常考题难易度：普通

What can trees do _________ us ?
They can _________ harmful gases and produce oxygen .

A、helping , take in B、to help , take in C、helping , take out D、to help , take care

举一反三

Don't __________ others. Sometimes you make mistakes, too.

I'm sorry, I don't have anything more about the travel book.

I usually forget _______ the window, but I remember_______ it yesterday.

We should {#blank#}1{#/blank#}(为……付款)these new books.

Factories that give off poisonous gas must be paid attention to{#blank#}1{#/blank#} (reduce) air pollution.

After searching for one month, he finally managed____an apartment near his office.

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