16. Is this the style of hair that your wife wants to have?
17. Rod Lee, whose sister I know, has won an Oscar.
18. I had come to see Mr Smith, who was too busy to speak to me.
19. One of the elephants which I saw at the zoo had only one tusk.
20. She is the most intelligent woman that I've ever met.
21. We have to cut down our daily expenses for the reason that you didn't tell us.
23. That car whose engine is very good belongs to Dr. Clark.