Dear Mr Thomas，
     On behalf of the Students'Union，I am writing this letter to invite you to participate in our Oral English Contest as a referee．（写此封信的目的）
     Our Oral English Contest is going to be held in the school classroom A2-210 at 2：00 p．m．next Friday which contains three steps．高分句型一）The first step is to introduce him/herself．The second step is to read a passage，The last step is to speak with the referee and answer some questions．So it will surely offer you a good opportunity to obtain a clear picture of Chinese traditional culture．We should be very glad if you could come，and meanwhile，our Contest would be more cheerful if you could deliver a performance．（高分句型二）（介绍口语大赛的目的和形式）
Yours，
Li Hua． Dear Mr Thomas，
     On behalf of the Students'Union，I am writing this letter to invite you to participate in our Oral English Contest as a referee．（写此封信的目的）
     Our Oral English Contest is going to be held in the school classroom A2-210 at 2：00 p．m．next Friday which contains three steps．高分句型一）The first step is to introduce him/herself．The second step is to read a passage，The last step is to speak with the referee and answer some questions．So it will surely offer you a good opportunity to obtain a clear picture of Chinese traditional culture．We should be very glad if you could come，and meanwhile，our Contest would be more cheerful if you could deliver a performance．（高分句型二）（介绍口语大赛的目的和形式）
Yours，
Li Hua．