20．解析：选D　when“当……的时候”；whether“是否”；where“哪里”；how“如何”。生活不是我们发生了什么，而是我们如何看待它。故选D。

　　Ⅲ.第一句：friends→friend

　　第二句：curiously→curious

　　第三句：do→doing

　　第四句：but→and

　　第五句：is→was; that→what

　　第六句：去掉to

　　第八句：printing→printed

　　第九句：liked后加it

　　第十句：a→the

　　Ⅳ.参考范文：

　　Recently, I have viewed “Under the Dome”，a smog documentary released by Chai Jing. I think haze weather results from air pollution. Some factories and private cars emit poisonous gas, which are to blame.

　　In my daily life, I often walk to school instead of taking my father's car. At home and school, seldom do I switch on the air conditioner. Besides, in the Spring Festival, I persuade my family and my friends not to set off fireworks. Additionally, I frequently tell the people I meet to protect the environment as much as they can.

　　I will continue to go green and appeal to my classmates to make efforts to live a green life. I hope our sky will be sunny and blue soon.

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