Dear Tracy,
How are you going recently? It' s almost a month I saw you off at the airport. I miss you a lot. Please accept my (感谢) for all that you have done to help me with my study.
Whenever I got into trouble, you were always there, reaching out a hand for me to hold. It was your help and encouragement helped me get through all the difficulties and made me what I am today. I couldn' t have made it without your timely help.
By the way, please come back to China for a visit whenever it is (方便的) for you. Anyway, you once told me that you enjoyed your travels across China. I am looking forward to (看见) you again.
Give my best wishes to your family.
Yours,
Li Hua