Dear Wei Fang,
I am pleased to know that you have won first prize in the English Speech Contest,so I'm writing to express my congratulations.
It comes no surprise to me that you have won first place in the contest,because I know your success is need efforts,and you are intelligence very much.I admire your determination that I very happy.As I know,you have been interested in English Culture.I hope you keep up to it.Would you like to give me some advice?
Congratulations again on your success.