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19. The pen which is blue is on the desk.
20. The boys are interested in football which is a popular game all over the world.
21. The boy who went abroad to study gave his parents big hugs before he left.
22. Borges, who never won the Nobel Prize, was a wonderful writer.
23. Their parents are anxious about their children who come back late.
24. My friends who had so much fun at the festival wanted to go there again.
25. Children like to eat ice-cream, which can cause toothache.
26. The car which we bought last week is blue.
27. His wife whose name was Angela died last year.
28. Mr.Phong, who is supposed to be at the meeting, hasn't come yet.
29. The girl whom we met at the party is a singer.

30. The bananas which George bought are on the table.
31. My parents whom you met last month send their best wishes.

21.The boy who went abroad to study gave his ..........

22.Borgers, a wonderful writer , never won the noble prize

23. Their parent are anxious about their children who come back late

24.My friends who had much fun at the festival wanted to go there again

25.Children like to eat ice cream that can cause toothache

26.The car which we bought last week is blue

27.His wife whose name was Angela died last year

29.The girl who we met at the party is a singer

30.The bananas which george bought are on the table

31.You met my parents who send their best wished last month