3．开头和结尾已给出，不计入总词数。

　　Dear Tom，

　　I'm terribly sorry to say

　　Yours，

　　Li Hua

　　参考范文：

　　Dear Tom，

　　I'm terribly sorry to say I can't go with you to the City Centre Library today because there is an urgent thing to deal with in my family and I have to go home immediately.

　　Can you do me a favor? I need you to help me return the books I borrowed last month or I'll be fined. You can take the No.1 bus at the bus station near our school, which will take you to the City Centre Library directly. The library opens from 9：00 am to 5：00 pm every day. You can study or read there if you have enough time. By the way, please borrow an English­Chinese dictionary for me. I will be very thankful if you can help me.

　　Good luck!

　　Yours,

　　Li Hua