Hello,John.
You are proud to get the first prize in the Chinese Cutural Competition.You are supposed to take part in the celebration party on the evening of the 10th,December,in the Beijing Friendship Hotel.You will reveive the the prize there.You won the prize of travelling in China for 10 days for free.You should fill in the form attached in the letter,and prepared the passport if you plan to travel to China.The committee will give the relative instructions for you.Hope that you can do well after my letter.
----the chairman of the China Cultural competiton.
你再凑凑字数。