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题型：单选题题类：常考题难易度：普通

-- We don't allow _________ in the library.
-- So we had better _________ outside.

A、smoking, smoking B、to smoke, smoking C、to smoke, to smoke D、smoking, smoke

举一反三

He used to to school late, but now he doesn't.

The old farmer saw a snake _______ on the road on his way home.

—You are studying hard you're sure to pass the exam.

—Thank you for saying so．

Eye contact can be the key{#blank#}1{#/blank#}communication.（填介词）

We must people from cutting down the trees.

You can tell me {#blank#}1{#/blank#} your holiday at dinner. (填入一个适当的介词)

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