56. As far as __________, October is the best time for your holiday.

　　A. I see B. I think C. I’m concerned D. it goes

　　57. The __________ of X-rays in 1895 was an important development in the history of medicine.

　　A. discovery B. invention C. arrival D. origin

　　58. Would you please __________ the text until you have finished the exercise?

　　A. not to refer to B. don’t refer to

　　C. not refer to D. doesn’t refer to

　　59. I wish I could go with you on the trip, but I __________ no time.

　　A. have B. had C. have had D. had had

　　60. I __________ you how to do it; why didn’t you ask me?

　　A. could show B. would show

　　C. could have shown D. showed

　　61. Let me tell you what to do next __________ I forget.

　　A. unless B. that C. before D. if

　　62. __________ is not known if he will come.

　　A. That B. This C. What D. It

　　63. If I had studied hard in the university, I __________ things easy now.

　　A. take B. would have taken

　　C. will take D. would be taking

　　64. __________, a policeman came to the scene.

　　A. Shortly afterwards B. Not long C. Sooner D. Lately

　　65. How much would you __________ me for repairing my bike?

　　A. pay B. take C. cost D. charge