105. 每个人都应该为保护环境做出自己的贡献。（contribution）

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104. 每次爬楼梯的时候，他都会喘不过气来。（every time）

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103. 不是他而是我们应该为这起事故负责。（用强调句式）

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102. 我的成功要归功于老师的鼓励和同学的帮助。(be due to)

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of the classroom is indeed necessary for we all.                           101.           

fully understand how hard is to earn money. Getting out                    100.           

to earn the money. However, I only finished 200. Now, I                    99.           

feeling sure I would easy finish 300 envelopes in five hours and              98.            

pay were 10 cent per envelope. I headed for the company,                         97.            

with good handwriting to write addresses on envelope. The                    96.