On ________Childrens Day,Jack received a prize for being ________honest boy.

On ________Childrens Day,Jack received a prize for being ________honest boy.

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You look tired.Youd better ____a good sleep.

You look tired.Youd better ____a good sleep.

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六氟化硫, 化学式为SF6 , 在常压下是一种无色、 无身、 无毒、不燃的稳定气体, 有良好的绝缘性, 在电器工业方面具有广泛用途. 六氟化硫分子结构为正八面体

六氟化硫, 化学式为SF6 , 在常压下是一种无色、 无身、 无毒、不燃的稳定气体, 有良好的绝缘性, 在电器工业方面具有广泛用途. 六氟化硫分子结构为正八面体结构(正八面体是每个面都是正三角形的八面

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—Look! There are so many people in the restaurant. —Yes. The food there ________

—Look! There are so many people in the restaurant. —Yes. The food there ________ be delicious.

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—Sam, ________ I join you in the community service? —Of course you can.

—Sam, ________ I join you in the community service? —Of course you can.

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