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 处错误，每句中最多有两处。错误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；在错的词下划一满线，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 Sir，

    Thank you for invite me to the summer English course in your school. As for your choice between the two courses,   prefer the four-week course because of this will allow me more time to do sora traveling and make a few mw friends. Of all the subject I'm teaming at school, I like English best. I had been learning English for eleven years but my spoken English remains poorly, So I real hope to take this chance to improve it. If possible, I'd like to slay with a family for a couple of days in order that I can knew some customs  in England- what I'm particularly interested in,I believe I will have wonderful time this summer.

YouR truly,

Grace