Dear John,
　 I'm so glad to hear that you've come back from aboard. I miss you so much,however, i have to say sorryas i cannot attend your party to be held on Sunday.
The college entrance eamination is coming. As you know, i want to be admitted to the university i'm dreaming of, so i'm making my greatest efforts to prepare for it day and night these days. Besides, I got a bad cold yesterday and the doctor advised me to have a good rest.
It's agreat pity that i cannot see you this weekend, my friend. Can wemake it another time? Is it convenient to you if we meet nextSunday?
Best wishes.　　

　 Yours,
　Li Hua
Best wishes.　　
Sincerely yours,
　　 Li Hua