22. Go and get your coat.　 It’s　　　 you left it.

21. The thought　　　 he might fail in the exam worried him.

20. That is 　　　　Chairman Mao lived and worked at that time.

19. I asked the boy　　　 room Xiao Li lived in.

18. He was praised for　　　 he had done.

17. They want to make it clear to the public　　　　 they are doing an important and necessary job.

16. I’d like to know the reason　　　　 you changed your plan.

15. The reason why I burst into rears is　　　 I don’t want to part from my mother.

14. That is　　　　 he is wrong.

13. The reason is 　　　　his mother was ill.