they cool our cities and clean the air

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• Trees not only cool the air but also clean it.
• the earth is our home.we must ___the land,air,and water clean.为什么是keep而不是get
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• stop reading for a minute and think about what you see when you look up in t首字母填空 有完整文的发下问题补充：是一篇文章 T did so to find their ways in the darksome stars are s far away from usthat some are m up of hot gassesshine t the air before you see the star stars also have different c to our s ,the cool stars
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