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Air   (pollute) is mainly caused by industry.

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environmental engineers designed an object for cars removing harmful pollution  the cars are very small  the cars don’t use gasoline any longer  
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besides    beside    therefore    otherwise  
therefore  moreover  however  otherwise  
to pollute…take   from being polluted ..be done   to be polluted…be taken    from polluted… be done  
therefore    moreover    however    otherwise  
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air  water  earth  feeling  
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