谢谢你的翻译，我还有篇英语文章，想修改一下。不知道你能不能帮我看看。

1.时态I had never done ....., because I don’t think..... had改成have，时态一致
2.because I don’t think it’s right time we undertake ...... we改成for us to句子结构混乱
3I spent most of my free time reading......spend
4.I am sure excellent students in your university needn’t worry.... student；your改成my或者去掉，needn’t前加who引导从句
5.最后一大句感觉有点乱，你写这个是要为什么作为证明？但是没写清楚啊！这样结尾的话太突然了。

Unlike most other classmates, I have never been engaged in commercial job in the university, because I don’t think it’s right time for usto undertake commercial business. Moreover, our income will not equal to our labour. Instead, I spent most free time on reading , taking exerxise and joining voluntary activities .I read mathematical philosophy, economics ,classic literature and contemporary poetry. Basketball ,badminton and ping-pong are all my favorite sports. I am surethat excellent students in our university needn’t to worry about the tuition and living expenses .Actually, our team took part in a mathematical modeling contest on behalf of our university in Sep,2011,we got a 3rd contest prize and subsidy.