【正确答案】 December 14
Dear Mr. Smith,
Thank you very much for your letter dated December 10. We are honored to know you intend to cooperate with us. Could you come over on the 20th this month to my company so that we can discuss the details of our cooperation? I really hope our cooperation can achieve something and promote the development mutually. If you agree to the invitation, please inform me of your flight number. Miss Wang, my assistant, will meet you at the airport.
I am looking forward to your reply.
Yours sincerely,
Li Fang
Manager of Sales Department