Dear，
I am writing to express my heartfelt gratitude to you for .
If it had not been for your assistance in giving me aid and , I fearthat . /Without your help, I would not have done .During the ,you have given me generous help and continuous guidance by .Thus, I reallyappreciate , and I hope that I may repay your kindness by .
Finally, I feel most obliged to thank you once more.
Yours sincerely,
Li Ming
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