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Dear John: I'm Li Hua,and I am glad that you invite me to your home for dinner . I want to go but I'm afraid I can't,because I have to parpare an important exam in the day after tomorrow. So I apoloze to you and I hope you can forgive me. Though I can't go but I hope you could have a good time ,and I think we could have another meeting after my exam.If you have free time please contact me. best wishes to you and your family ! Yours Li Hua