37. She had three sons, all ___ became doctors.

A. who 　　B. whose　 　C. of which 　　D. of whom

36. She showed her new watch to my wife, ___ was kept in a box.

A. who 　B. which 　C. that 　D. it

35. I'll never. forget the day ___ I joined the League.

A. on which 　B. which 　C. in which 　D. at which

34. Do you know who lives in the building ___ there is a well.

A. in front of it 　　　　　B. in front of whose

C. in front of which　　　 　D. in the front of which

33. It's one of the most important meetings ___ this years.

A. that has been held 　　　　B. which has been held

C. that have been held　　　 　D. which have held

32. Did you tell your mother all ___ you had seen on the way home?

A. what 　B. why 　C. that 　D. which

31. The Second World War ___ millions of people were killed ended in 1945.

A. on which 　B. where 　C. in that 　D. during which

30. Is oxygen the only gas ___ helps fire burn?

A. it 　B. which 　C. /　 　D. that

29. I've read all the books ___ were borrowed from the library.

A. they 　B. where 　C. / 　D. that

28. She hasn't got enough money ___ to buy the rings.

A. for which　 　B. with which 　C. that　 　D. which