连词成句。
1. plant, in, can, we, March, more, trees (.)
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2. I, to, metro, take, usually, the, school (.)
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3. help, they, keep, air, the, clean (.)
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4. move, our, city, away, some, we, factories, can, from (.)
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5. can, we, what, keep , to, do, city, our, clean (?)
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