49. Although they plant trees in this area every year, the tops of some hills are still _D_.
A blank B hollow C vacant D bare
blank adj. 空白的(因为没写字而空白); hollow adj. 空心的，中空的;
bare adj. 光突突的(山上没有树和草);没带首饰的; bald adj. 秃顶的。
50. Being a pop star can be quite a hard life, with a lot of traveling _D_ heavy schedules.
A with regard to B as to C in relation to D owing to
owning to = due to 因为。
52. William Penn, the founder of Pennsylvania, _C_ defended the right of every citizen to freedom of choice in religion.
A peculiarly B indifferently C vigorously D inevitably
peculiar adj. 奇特的; indifferently adv. 冷漠地，不积极地;
vigorously adv. 强有力的，强劲有力的; inevitably adv. 不可避免地，必然地。
60. We have been told that under no circumstances _A_ the telephone in the office for personal affairs.
A may we use B we may use C we could use D did we use
61. In previous times, then fresh meat was in short _D_, pigeons were kept by many households as a source of food. [in short supply 供应不足]
A store B provision C reserve D supply
in previous times 从前; fresh water 淡水; fresh meat 鲜肉; dove n. 鸽子;
bean curd 豆腐; Bible 圣经; bible 具有权威性的书; God 上帝; god 神。
62. As Commander-in-Chief of the armed forces, I have directed that all measures _C_ for our defense.
A had been taken B would be taken C be taken D to be taken
以下几个表示“指挥，命令”的动词：order, command, direct.
在引导宾语从句时从句要用“(should) + 动词原形”来体现虚拟语气。
63. A thief who broke into a church was caught because traces of wax, found on his clothes, _A_ from the sort of candles used only in churches.
A had come B coming C come D that came
65. I was _B_ the point of telephoning him when his letter arrived.
A to B on C at D in
to the point of 到了…程度; on the point of doing sth. 正要做某事情;
at the point of 在某点上; when除了表示“当…时候”外，还可以表示“恰在此时”或“刚…就…”
68. The project _C_ by the end of 2000, will expand the city's telephone network to cover 1,000,000 users.
A accomplished B being accomplished
C to be accomplished D having been accomplished
69. _C_ evidence that language-acquiring ability must be stimulated.
A If being B It is C There is D There being
evidence表示“证据”，最大的特点是后面经常带同位语从句说明证据的内容。
language-acquiring ability 语言习得能力。 evidence不用在“it is …”这种结构当中。
64. After the guests left, she spent half an hour _C_ the sitting-room[客厅].
A ordering B arranging C tidying up D clearing away
order vt. 命令;订购;整理，使有条理性; order one's thoughts 整理思路，整理思绪;
arrange v. 布置，安排; tidy up 整理，使整洁(后面通常加某个房间);
clear away 把…清除掉。
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