连词成句。
1. young, is, to, school, Mary, too, go, to (.)
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2. city, China, capital, of, Beijing, is, the (.)
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3. Xi'an, you, when, for, do, leave (?)
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4. it, far, is, to, how, from, Xi'an, Beijing (?)
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5. want, them, come, trip, our, on, I, to (.)
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