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(因為沒寫字而空白); hollow adj. 空心的，中空的;
bare adj. 光突突的(山上沒有樹和草);沒帶首飾的; bald adj. 禿頂的。
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 因為。
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，不積極地;
vigorously adv. 強有力的，強勁有力的; 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 供應不足]
A store B provision C reserve D supply
in previous times 從前; fresh water 淡水; fresh meat 鮮肉; dove n. 鴿子;
bean curd 豆腐; Bible 圣經; bible 具有權威性的書; 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
以下幾個表示“指揮，命令”的動詞：order, command, direct.
在引導賓語從句時從句要用“(should) + 動詞原形”來體現虛擬語氣。
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 在某點上; when除了表示“當…時候”外，還可以表示“恰在此時”或“剛…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“證據”，最大的特點是后面經常帶同位語從句說明證據的內容。
language-acquiring ability 語言習得能力。 evidence不用在“it is …”這種結構當中。
64. After the guests left, she spent half an hour _C_ the sitting-room[客廳].
A ordering B arranging C tidying up D clearing away
order vt. 命令;訂購;整理，使有條理性; order one's thoughts 整理思路，整理思緒;
arrange v. 布置，安排; tidy up 整理，使整潔(后面通常加某個房間);
clear away 把…清除掉。
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