连词成句。(注意字母大小写和标点符号)
1．is, useful, water, very (.)
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2．comes, it, from, sea, the (.)
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3．water, use, put, to, out, fires, firemen (.)
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4．use, to, grow, water, crops, farmers (.)
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5．we, use, how, water, do (?)
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