I am sorry that I have to say something different from most of the people have commented her. over all,you are pretty good, however, you have a little trouble pronouncing some of the words. Please listen to some of the news broadcasters very carefully and try to imitate them. By doing so, you will minimize your Chinese accent and to acquire a tone that is more like American English. I hope I did not hurt your feeling. Just trying to be helpful here. Thank you very much for posting your work here for us to enjoy.