46. In 1990 he caught a serious illness from _____ effects he still suffers.
A. that B. which
C. what D. whose
47. His brother had become a teacher， _____ he wanted to be.
A. who B. what
C. which D. that
48. My vacation begins next Tuesday， _____ I will leave for Flofida.
A. which B. that
C. while D. when
49. He has made another wonderful discovery， _____ of great importance to science.
A. which I think it is B. of which I think is
C. I think which is D. which I think is
50. I decided to buy a car because we had sold _____ we had in England before leaving.
A. that B. the other
C.which D. the one
51. The investigation， _____ will soon be published， was made by John.
A. at which the results B. the results on which
C. whose results D. at whose results
52. Crude oil is refined in a refinery， _____ makes it possible to get many grades of oils for different uses.
A. as B. that
C. this D. which
53. I am sure that _____ you said is wrong.
A. which B. all
C. this D. how
54. He arrived late for the tea party， _____ made us all very disappointed.
A. which B. this
C. it D. that
55. The people at the party were worried about John because no one was aware _____ he had gone.
A. where that B. where
C. of the place where D. the place
56. Is there anyone you can think of _____ may know her address?
A. which B. that
C. who D. what
57. Perhaps the day will come _____ people will live 150 years.
A. which B. that
C. who D. what
58. It was raining， _____ was a pity.
A. what B. that
C. as D. which
59. This is the reason _____ an aeroplane can‘t fly in space.
A. which B. why
C. where D. for that
60. We‘ve tested three hundred types of boot， _____ completely waterproof.
A. no of which B. none of which
C. some of that D. neither of which
