假定英语课上老师要求同桌之间交换修改作文，请你修改你同学写的以下作文。文中共有10处语言错误，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 Sir or Madam,

I see your advertisement in a student magazine and I’m interesting to know more about your diving courses. First of all, I should explain that although I can swim I’m not very confident in the water. But you mentioned your advertisement that your instructors are full qualified. Thus I believe they’ll be able to teach someone as me to dive. I have one week’s holiday in the three week of June and would like to know that if there’s a course running at that time. How much does a week’s course worth? Finally, if I decide to go ahead, are there any special equipment I need to buy or is everything provided by your company?

I am looking forward to hear from you.

Sincerely yours,

Tom