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Now many children like surfing ________ _________ the Internet, but ________ the same time they should know that there is something unhealthy on it.

  A. for;in  B. at;by  C. on;at  D. in;on

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2.

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C.having

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3.

A.begin

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C.begins

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5.

A.to

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A.much

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A.stand

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A.them

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C.they

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A.home

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