连词成句。
【小题1】place; Earth; beautiful; is; the; a (.)
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【小题2】from; the; dirty; makes; smoke; and; factories; air; cars; the (.)
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【小题3】together; people; healthy; to; the; work; Earth; clean; keep; and (.)
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【小题4】we; rivers; into; throwing; should; stop; rubbish (.)
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【小题5】trees; we; cutting; many; stop; down; so; should (.)
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