________________________________________________________________________

　　________________________________________________________________________

　　Yours truly，

　　Li Hua

　　One possible version：Dear_John，

　　I am extremely sorry to tell you that I am unable to go to your party this

　　Sunday.It is very kind of you to invite me to your house and I really look forward to going to your party and sharing your happy 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 preparing.

　　What’s worse，I have caught a bad cold lately and I am really not myself.

　　Anyway，we will have many more chances to get together.Shall we make it after the Exam?

　　I am truly sorry，I hope you will forgive me and accept my sincere apologies.I look forward to your reply.

　　Yours_truly，

　　Li_Hua

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