急求一篇英语作文,给Jack的感谢信

以下为本人按题目要求写的英语作文,
Dear Jack,
How are you doing recently?Hope this finds you well.
I am writing to show our sincere gratitude for your brave and remarkable help during the disaster of debris flow.As a doctor,what you did is great and unforgettable.I hereby represent all the volunteers and survivors to thank you for many lives were saved by your heroic behavior during the rescue.You definitely deserve the respect of each one of us.
Best regards,
Li Xin
Jan 23rd,2012