6. The man whom I respect most is my father
7. The man whose opinion I respect most is my father
8. Mary and Margaret, whom you met yesterday, are twins
9. I'll introduce you to the man whose support is necessary for your project
10. The middle-aged man, whom my father is talking to, is the director 
 

11. The boy whom you make fun of is my cousin
12. The student who sits next to me is from China
13. I thanked the woman who had helped me
14. The professor who course I'm taking is excellent
15. Mr Smith, whom I had come to see, said he was too busy to speak to me

16. I saw a lot of people and horses that I went to market
17. Tom has three sister, all of whom are married
18. I recently went back to Paris, which is still as beautiful as a pearl 
19. I recently went back to Paris in which I was born nearly 50 years ago
20. Do you know the music which is being played on the radio

21. You didn't tell us the reason for which we have to cut down or daily expenses
22. The day when she left was rainy
23. I've sent him two letters, neither of which he has received 
24. That man whose name I don't remember is an artist
25. We saw these elephants at the zoo, one of which had only one tusk