写作任务与要求：
假设你叫李华，你的一个朋友John刚从美国归来，邀请你参加本周日在他家举办的朋友聚会，但是你不能参加，请你根据下面的要点给他写一封回信：
1、表达想参加的意愿；
2、忙于准备高考；
3、由于感冒，身体不适；
4、表达歉意并另约时间 Dear John,
I’m extremely sorry to tell you that I am unable to go to your party this Sunday.It’s very kind of you to invite me and I really look forward to going to your party and sharing your wonderful experiences abroad.
Much to my regret, I will be absent from your party owing to the fact that the College Entrance Exam is just around the corner, for which I am now really busy praparing.What’s worse, I have caught a bad cold lately and I’d rather stay at home instead of going anywhere.Anyhow, we will have many more chances to get together.Would it be convenient for you if we make it after the exam?
I’m truly sorry.I hope you will forgive me and accept my sincere apologies.I’m looking forward to your early reply!
Best wishes!
Yours,
Li Hua
