用英語給外教寫道歉文

Dear XX:

How are you doing?

I am xx in your xxx class(在您的xx課裏面，這個通常需要説明一下吧。). I want to apologize for the exam from last week. I missed the exam cause i was sick. i waited ouside of our classroom from 4:00 to 4:30 pm but no one was there， so i left.

And also i went home because it was dragon boat festival it is a very important festival for chinese. I was not in school this morning so i missed the class.

I am really sorry about that.

Regards