假设你是李华，你的美国笔友Jack给你发来一封电子邮件。请你根据邮件内容用英语给他回复一封电子邮件。 

 Dear Li Hua,  

 How are you doing? 

I had a quarrel with my friend Bob last Monday, and we haven't said anything to each other since then. But I don't want to lose a good friend. What should I do?

 Yours, 

 Jack 

 注意：1. 词数：100-120；2. 可以适当增加细节，以使行文连贯；3. 开头、结尾已给出，但不计入总词数。 

 Dear Jack, 

 …… 

 Yours, 

 Li Hua