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