thank you all for giving the advice.i am also benefit a lot from my foreign teacher.i'll try my best to practice more.

Most importantly, you need to open your mouth, and speak. Just don't be a perfectionist and don't be afraid to speak- Always remember that we learn something as we haven't yet master it, and so making mistakes is inevitable. So, we learn from our mistakes. Perhaps you can endeavour to practice your oral English with the assistance from your family or friends. For instance, I speaks English with my dad while he responds to me in Mandarin. If he fail to grasp my meaning, I'll try to make him understand by making sign. I think my suggestion deserve a try.

You can try to listen to radio broadcast daily. If you don't have much time to do so, you can try to do it passively, means you don't need really to pay any attention to the contents of the broadcast, you just turn on your radio, while doing other things.

i'd rather say that you should regularly listen to english speaking! but not just listening, i recommand to watch english programs so that you can observe the accurate way of spelling words. Good luck.

It's also a problem of mine! When I read out or I speak I feel like a beginner...I think that the right way to improve is practice, that I miss.