Hello, Anne! I am honored that I have the chance to have dinner with you in your house but I am terribly sorry that I have to prepare for an important examination for the day after tomorrow. It is so important to me that I must devoted to it so I can't go to your house and have dinner with you. It is really a pity for me and I appreciate your invitation very much. I hope that you can have a nice weekend and we will have dinner together for another time.
Best wishes to you!
Yours
Liming