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Dear John Thank you very much for inviting me to have dinner with your family tomorrow evening.Unfortunately,I am afraid I will not to be able to make it.There is a very important exam the day after tomorrow,and I am fully occupied in preparing for it .I am terribly sorry for missing such a good get-together and I hope you will have a good time.I wonder if it is possible for us to have a private chat later.please call and tell me about your perferable time. Please accept my sincere apologies. Yours Lihua