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1、Our city is becoming an international city now.But there are a lot of people dropping litter on the ground everywhere.Many people have bought cars,the traffic becomes heavier and heavier,at the same time,the air is getting worse,***.In this case, I think it is our duty to keep our city clean and tidy.We must obey the traffic rules .People had better go to work by bike or by bus.Then our city will be more beautiful.。

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