The young teacher who has a ____face can make his classes ____and interesting.

The young teacher who has a ____face can make his classes ____and interesting.

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There ______ some meat and vegetables in the fridge. ( )

There ______ some meat and vegetables in the fridge. ( )

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He can ______ (play) the piano.

He can ______ (play) the piano.

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—I think it’s polite _________ the young to offer seats to the old.—Yeah, and it

—I think it’s polite _________ the young to offer seats to the old.—Yeah, and its necessary _______

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铜及其化合物在生活、生产中用途广泛。(1)以氧化铜为原料制取铜。某研究小组为探究CO的还原性,设计了如下系列实验。实验1:将CuO加水制成糊状,刷在试管内壁,在

铜及其化合物在生活、生产中用途广泛。(1)以氧化铜为原料制取铜。某研究小组为探究CO的还原性,设计了如下系列实验。实验1:将CuO加水制成糊状,刷在试管内壁,在试管底部加入炭粉,再向试管中通入CO2(

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