假如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 Ms Smith,

    I am Li Hua. I am writing to ask a several-hour leave. I was to give a speech to welcome a group of American visiting teachers on Wednesday morning. I am terrible sorry to tell you that I can't come to attend at your class. How a pity!Perspectives on American Literatureare always my favourite course. I do hope you can excuse my absence. As to the lessons to be missing, I wonder if it is possible for them to be recorded so that I can listen to it later. Or I will just read my classmate's notes and making them up as soon as possible.

    Your permit will be appreciated. Thanks a lot !

Yours,

Li Hua