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Dear Tom
thank you so much for your invitation. I really appreciate your gesture but i am very sorry to tell you that i am going to decline your offer. This is because i am the only child in the family and so i have to be by my parents' side, they are old and need to be taken care off. Going to America to work at your travel agency is a tempting offer but it's too far away from my parent. I hope you understand my situation. Nevertheless, i can still go to America to visit you someday, or even better you can come over to visit me and i will show you around this wonderful country. Hope to hear from you soon.

Best Wishes,
Li Ke