假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。每处错误仅涉及一个单词的增加、删除或修改。
增加：在缺词处加一个漏字符号(∧)，并在其下面写出该加的词。
删除：把多余的词用斜线(＼)划掉。
修改：在错的词下划一横线，并在该词下面写出修改后的词。
注意：
1．每处错误及其修改均仅限一词；
2．只允许修改10处，多者(从第11处起)不计分。
Dear Bob，
I studied in your school for six month a couple of years ago．I’m very grateful to your help during my study in the U．S．Without your help，my English couldn’t have improved so rapid and I couldn’t have been enjoyed my life there so much．Do you know why everything is going with Mr．Smith? I failed to get in touch with him after I leave America．I’ll be very thankful if you can offer me his e-mail address．
I remember that you are very interesting in Chinese culture．I’m very glad to invite you to China during the Spring Festival enjoy our culture．I’m sure it will be a unforgettable trip. I’ll be happy if you can accept my invitation．
I’m looking forward to hear from you soon．
Li Hua