【答案解析】Dear Tom,
Thank you very much for sending me a birthday present. It is kind of you to remember my birthday and send me a helpful Japanese dictionary. As soon as I got the dictionary, I started to use it.
In the past, my classmates made fun of me when I read Japanese, because my Japanese pronunciation was very strange and I often made mistakes. Now I can look them up in the dictionary if I meet any new words. It"s really helpful for me.
I really appreciate your present and hope you can come to China this winter holiday, and I will have the chance to show you around our city. I"m looking forward to hearing from you.