__________did the pianist begin to play the piano?— When she

__________did the pianist begin to play the piano?— When she was four.

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It's easy__________a chicken sandwich.

It's easy__________a chicken sandwich.

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What can I do for you?—I want two__________bread and a glass

What can I do for you?—I want two__________bread and a glass of milk.

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一项工程,甲单独完成需10天,乙单独完成需15天,丙单独完成需20天,三人合作3天后,甲有其他任务而退出,剩下乙、丙继续

一项工程,甲单独完成需10天,乙单独完成需15天,丙单独完成需20天,三人合作3天后,甲有其他任务而退出,剩下乙、丙继续工作直到完工。完成这项工程共需用多少天?

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