假如你是李华，你班的美国交换生Tom结束了在你校一年的学习，即将回国。你和同学打算于12月30日下午在班上为他开一个欢送会（farewell party），特写信邀请他参加。要点包括：
1)．感谢Tom的帮助；
2)．欢送会的时间和地点；
3)．对Tom的美好祝愿。
注意：1.词数100左右；可适当增加细节，以使行文连贯；开头和结尾已给出，不计入总词数。
Dear Tom,
How time flies! It's one year since you came to study Chinese in our school.
Yours sincerely,
Li Hua
Dear Tom,
How time flies! It's one year since you came to study Chinese in our school. We're all grateful for what you have done for us. In the past year, you have helped us a lot, without which we couldn't have made great progress
