N (người) + who + V

N (người) + whom + S + V

N (vật) + which + V/ S + V

N + whose + N

N (người/vật) + that+ V/S +V

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1. Who

2. Which 

3. Whom

4. Which

5. Whose

6. Whom

7. Whose

8. Which

9. Who

10. Whose

11. Which

12. Whose

13. Whom

14. Who

15. Who

16. Which

17. Whose

18. Who

19. Which

20. Whose