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Dear John, I was so excited when I received the invation from you.I feel honour that you invate me to have dinner with you at your home.Great thanks for your invation. However,I am greatful to told you that I couldn't come to keep my promise.Beacuse I will precipate in an important exam and I have to prepare for it.I must say sorry for that.Dear friend,I wish you can forgive me and I wish you will have a wonderful time.Let's make it another time. Saying sorry again and I beg your pardon. yours sincerelly, Li Hua