Dear Ms.Dong,
Good days to you!I am writing to appologize for missing your classes recently. I slept not well last night , and I didn't hear my alarm clock , so I cut classes in the morning. I have been regretted for what I've done,and make a decision that I will not be absent in your class from now on.I promise that I will try my best to be a good student and never bring you any trouble.I have the confidence that I'll surely be interested in your lessons in near future through my endeavor in study.I will catch up with my classmates not before long.Hoping you could trust me.
Please accept my sincere appologize.Thank you!
Sincerely yours,
Li Cheng-long