【答案解析】Dear Mr. Smith,
I am writing to recommend Zhang Ying, a close associate of mine, who is trying to find a teaching position in the U.S. to teach Chinese.
Mr. Zhang is an outstanding candidate. He has obtained the Certificate of Ability to teach Chinese as a Foreign Language. As a hard-working gentleman, he gets along well with others and will be an enthusiastic and pleasant colleague. If Mr. Zhang could be given the opportunity to work in your school, I am confident he will be an excellent worker and meet what is expected of him.
Finally, I will see this as a very special favor, and will be extremely pleased to reciprocate you in the future.