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Dear John I am li hua.how are you?Firstly, I am thanks for your invitation,which is have dinner at your home.But it is a pity,,in order to make preperations for coming exams ,I have to say sorry for your invitation .Secondly,i am desiered that you should forgive me.After all,I am dying to get a satisfying end. Even though in myself absene,I hope you have a wonderful time.Hardly had i visited you when i end of the exams.We are the best friends.Isn`t it?Shall you understanging me?