错多了,改完如下：
Hello,Everybody!I am a student studying in the Yucai primary school.With the enterance into 2008,we are getting closer and closer to the historical date of 8th August.As a Chinese citizen,I feel more and more excited,and keep wondering what we can do for the Olympic Games in the next 152 days and nights?
Firstly,I'd love to learn from the young Olympic heros,who strive for success.I shall never forget the time when Mr Xu Haifeng won the first gold medal in Los Angeles,never forget Mr Wang Yifu ejecting the last shot in Sydney,and never forget each athlete's sweat and endeavor.I shall equip myself with such striving spirit in my life,never fear any difficulties,and finish everything earnestly!
Secondly,I shall practise my English,to become a young Olympic propagator,publicizing the Games and the Beijing city to friends from allover the world when the Olympic Games begin.
Finally,I shall cherish our environment,keep the sky blue and water clean in Hangzhou in 2008.Starting from myself,I will not throw rubbish anywhere but categorize it,I will use electricity frugally and protect our precious resources.I will cherish flowers and trees,and participate in tree-planting activites.I will also tell everyone around me,that our Olympic Games will be the greenest Olympic Games!
152 days and nights are too short,and I have many many things to do.But I know so long as we pay diligently,so long as we grow health,(这句没看懂什么意思) I can proudly say:I contribute to the 2008 Beijing Olympic Games!