【题目】连词成句。
【1】dirty, smoke, cars, the, from, makes, air(.)
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【2】clean, what, we, do, can, to, the, keep, classroom(?)
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【3】water, there, a, is, lot, rubbish, the, of, in(.)
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【4】school, we, take, bus, can, the, and, metro, the, to(.)
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【5】city, please, some, move, factories, from, away, our(.)
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