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You(必须告诉他)when you will return.

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Young people(应该尊敬老人)at any time.

(我们是否可以带照相机) with us when we visit the museum?

Without his father's approval he(不得不放弃自己的旅游计划).

Henrymustn'tbe at home because hephonedmefromthe farmjust now.A BC D