尊敬的专利教授：
我很抱歉地通知你，由于几天前突然生病，我没能完成你上周布置的读书报告。在过去的几天里，我一直在医院里发烧，这使我无法进行任何学术活动。我特此提交医生注意。
如果你能再给我一周时间完成这项任务，我将不胜感激，因为我的健康状况正在好转。
希望你能理解我的处境，接受我的道歉。
你忠实的，
ear David: I am afraid that you will think me unpardonably negligent in not having answered your letter dated 7, December sooner, but when I have told you the reason, I trust you will be convinced that the neglect was excusable.
When your letter arrived, I was just in Hong Kong. As my family could not forward it to me during my absence, it has been, therefore, lying on my desk until the moment when I took it up. Now the first thing I have to hasten to do is to write to you these few lines to express my deep regret.
I enjoyed many pleasant sights during my trip. I shall be pleased to give you an account to of them when I see you next.
Dear Miss Dong
You know that I enjoy your class very much.It’s interesting and fantistic.However,Imissed your class last Thursday.A good friend of my senior high school came to see me.So I have to welcome him and take him look around our school.what should I to make up the class? I should let you know in advance .But there are some reasons that I can’t tell you.I hope you will accept my sincere apology.
Your student,
Lan Bo