56. It was not until August _____ the two sides finally reached an agreement.

　　A. when B. that

　　C. before D. while

　　57. Don’t worry. She______ it by the time you are ready.

　　A. will be finishing B. will have been finishing

　　C. would finish D. will have finished

　　58. ________will be known tomorrow.

　　A. Whether the flower turns red

　　B. If the flower turns red

　　C. When does the flower turn red

　　D. How does the flower turn red

　　59. At midnight, she finally finished the report, ______.

　　A. tiring and wear out B. tiring and worn out

　　C. tired and worn out D. tiring and wearing out

　　60. Rare animals are still being hunted, ______ there is severe punishment for it.

　　A. as if B. even though

　　C. even as D. as long as

　　61. Before entering the classroom, Professor Lucas heard_________.

　　A. the students at talk B. some students talked

　　C. some students talking D. the students to talk

　　62. The assignment for today is to write a summary _______the major subjects in this chapter are to be covered.

　　A. in that B. that

　　C. which D. in which

　　63. We________ on it for several hours, but we have not yet found any satisfactory solution.

　　A. are working B. have been working

　　C. have been worked D. work

　　64. I would have invited Doctor Fox to make a speech, but I _________him very well.

　　A. hadn’t known B. don’t know

　　C. wouldn’t know D. wasn’t knowing

　　65. _________ objects in the distance is made possible with the help of a telescope.

　　A. Observation B. Observatory

　　C. Observed D. Observing