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I'm free tomorrow, we can find a good place to ________ ________. (闲逛)

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Though he is a policeman, he usually wears ________ ________ after work. (便服)

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Cartoons are ________ ________ ________ for children, many young adults like them, too. (不再，仅仅)

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One of ________ ________ of doing that job is that you can get a high pay. (优势)

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It's very dangerous if you are not careful enough and ________(掉进) the pool.

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________(这样) you can come up with the answer to the very difficult math problem easily.

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The thing with dragons and frogs on it ________(被用来) testing earthquakes in old China. It's very useful in those days.

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________(根据) an ancient Chinese legend, tea was discovered by an emperor when he was boiling water over an open fire.

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Did you know that the most popular drink in the world ________(是偶然被发明的).

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John told me to wait for him outside the school gate at eight but he didn't ________(露面).