65. He lay ___ the grass was the thickest. A. where B. when C. that D. after
64. Go back ___ you came from. A. until B. where C. which D. when
63. The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
62. Difficulties are nothing ___ we are not afraid of them.
A. for B. as C. if D. whether
61. I'd like to go swimming ____ the water is not too cold.
A. for B. unless C. if D. whether
60. I can't use your pen, ___ there is no ink in it. A. for B. when C. if D. whether
59. Things have changed a lot ____ I wrote to you last time.
A. when B. since C. as D. before
58. ___ he came to study in the university, he has made much progress in the study of English.
A. While B. When C. Since D. After
57. I'll come and see you _____ I go to the countryside.
A. while B. when . C. as soon as D. before
56. Don't try to get off the bus ____ it has stopped.
A. while B. as C. since D. before
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