Dear Sir,

　　How are you ?long time no see  .

　　I was told that you decided to support me for my further study. I was so excited and deelply appreciated that you can help me. My parents also appreciate your finacial support so that I don't need to worry about discontinuing my study. I will try my best to study as hard as I can and my outstanding achievement will be my best return for your help.

　　Currently, there's a very big global financial crisis happend, including United States. I hope that you didn't get any bad impact from it.

　　Kindest Regards and all the best to you,

　　Yours sincerely +(yourname)