参考答案

参考范文：
Dear Jam,
    I' m writing to recommend my friend Han Ling to teach you Chinese as a second language. She is an outstanding candidate and deserves my highest recommendation. She has been certified to teach Chinese as a foreign language. As a hard-working and dependable woman, she gets along well with others and will be your enthusiastic and pleasant friend. If she should be given the opportunity to teach you, I am confident she will do the work well and meet what is expected of her.
    I would be most grateful if you could consider my recommendation and offer her the opportunity.