环境污染是当今世界上最令人头痛的问题，你知道污染有哪些，对我们的环境有怎么样的影响？作为学生的我们，该如何去做才能保护到我们周围的环境？请以“Saving the Earth”为题，写一篇80词左右的短文。

提示词：pollution, harmful, three Rs

---- What`s that             English ? ---- It`s a book .

I have        apple .

She         a pen , but I       a  ruler .

---- What`s that ?    ---- It`s        .

Jack has two         .

knife      B. knifes    C. knives    D.a knife

--     ! What`s that ? – I can`t        it .

I have a pen . I like           very much .

Please give this letter             Peter . He is            Class 1 ,Grade 7 .

--- Whose schoolbags are they ?     --- They`re          .