66. I’m so g________ for all your past kindness.
67. He has studied English for ten years and now he can speak English f________and accurately.
68.It is reported that this disease ________the central nervous system.（攻击）
69. Her success is owing to her positive a________ towards her work.
70. The refugees’main requirements are food and ________.（避身之所）
71. 8加4等于12。
4________________ 8 is 12.
72. 我们必须精通所学的知识，这样更有可能在未来有所创新。
Wemust ________________ the knowledge we have learned so that we’ll be more likelyto innovatein the future.
73. 与其乘汽车，我宁愿步行。
________________ travel by car, Iprefer to walk.
74. 入侵者把城镇变为废墟。
The invader laid towns and villages________________.
75. 我送给他一份礼物以回报他的帮助。
I sent him a present ________________his help.
76. Don’t get off the bus until it ________________(stop).
77. My pen ________________ (write) smoothly and it doesn’t need to be repaired.
78. She was seen ________________(enter) the manager’s office ten minutes ago.
79. His book ________________ (publish) last month is based on a true story.
80. You________________ (tell) me about it earlier. If Ihad known the truth, Iwould have helped her out.