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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

干热灭菌