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65. He lay ___ the grass was the thickest.  A. where   B. when   C. that    D. after

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64. Go back ___ you came from.   A. until    B. where    C. which     D. when

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63. The doctor will not perform the operation ___ it is absolutely necessary.

A. when         B. if         C. for          D. unless

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62. Difficulties are nothing ___ we are not afraid of them.

A. for          B. as         C. if         D. whether

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61. I'd like to go swimming ____ the water is not too cold.

A. for        B. unless       C. if         D. whether

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60. I can't use your pen, ___ there is no ink in it.     A. for   B. when  C. if   D. whether 

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59. Things have changed a lot ____ I wrote to you last time.

A. when         B. since       C. as          D. before

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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

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57. I'll come and see you _____ I go to the countryside.

A. while       B. when      .  C. as soon as     D. before

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56. Don't try to get off the bus ____ it has stopped.

A. while       B. as         C. since       D. before

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