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In my family, children __________ permission before leaving the dining table.

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It’s so _____________ to send a letter from my village. The nearest post office is miles away.

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My 6-year old brother really enjoys ___________ in the rain, which is sometimes dangerous.

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I know she has worked  much_____________ this semester than she did last semester.

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She prefers _______ with real people to _______ someone virtual on the Internet.

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Not many people can explain the ______________ of the customs and traditions at Tet.

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He is very studious. He always________ late at night.