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Dear Mr Smith,
　    Thank you very much for invite me to go and stay with                           1.       
you in Nanjing.It’s the most beautiful city,and I have been                              2.       
eager to see you again.So I’m very sorry to tell you that I can’t                      3.       
go this summer vacation,since I’ve already been promised                              4.       
to stay with my grandmother in the countryside.She has                                 5.       
already 65 years old and miss me so much that I have no choice                      6.       
but do it.I’m busy preparing for my college entrance exams                                   7.       
all these days and I feel quite sure of myself.I wish I can go,                          8.       
and see you and Tom at the end this year.                                                     9.       
Best wishes to both you and Tom!                                                               10.       
Yours sincerely,
Song Ping