One of your friends wants to apply for a job working with foreign teenagers. Write a letter to recommend him/her, describe his/her past experience, and explain the reasons.
Dear Sir or Madam,
I am writing to recommend one of my best friends, Zhou Botong, for this post. With his outstanding leadership and cheerful personality, he was elected chairperson of the Student Union of Tsinghua University several times.
Busy as he was, he completed his major, teenage psychology, with an outstanding school record. Upon graduation he was assigned to be a teacher in Tsinghua Middle School. What is more, he loves his job and enjoys working with children. This won him great popularity among his students.
Therefore, I do not hesitate to recommend him as an ideal candidate for the post you advertised. I am sure you will make a wise decision in hiring him.