22.　 He received a doctor’s degree in 1988.

21.　 An American company wanted to employ him with high pay, but he refused.

20.　 He graduated from Qinghua University in 1982.

19.　 He is a worthy person for us to learn from.

18.　 We all considered her pronunciation to be the best of all.

17.　 He is honest and always ready to help others. That’s why we made him monitor.

16.　 He is not only our good teacher but also our good friend.

15.　 He gets on very well with us students.

14.　 Many times he has been praised for his excellent work.

13.　 All these years he has been working hard.