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