31. It is not easy to learn English well, but if you _C_, you will succeed in the end.
A hang up B hang about C hang on D hang onto
hang on 坚持，继续下去。
32. It is reported that _C_ adopted children want to know who their natural parents are.
A the most B most of C most D the most of
most单独出现的时候有两种词性要考虑：1 adv. 非常;2 adj. 大多数的。
the most后面加多音节的形容词或副词构成该句的最高级。
most of + 名词，表示这些名词中的大多数。 make the most of 充分利用。
34. _D_ before we depart the day after tomorrow, we should have a wonderful dinner party. [Were they to arrive=If they were to arrive]
A Had they arrived B Would they arrive C Were they arriving D Were they to arrive
35. The strong storm did a lot of damage to the coastal villages: several fishing boats were _A_ and many houses collapsed.
A wrecked B spoiled C torn D injured
collapse vi. 倒塌，坍塌; wreck vt. (船只)遭到破坏。
torn原形是tear，n. 眼泪，vt. 撕裂，撕开。
37. As _B_ announced in today's papers, the Shanghai Export Commodities Fair is also open on Sundays.
A being B is C to be D been
注意两个非限定性定语从句的引导词：as, which。
which在做非限定性定语从句引导词时有两个特点：
1 which前要有逗号与前面句子分开; 2 which引导非限定性定语从句指的是前面整句话的内容。
只要引导非限定性定语从句as和which都指一句话内容，区别在于which只能放在它所指那句话的后面，而as可以在前面也可以在后面。
38. You see the lightning _A_ it happens, but you hear the thunder later.
A the instant B for an instant C on the instant D in an instant
the instant=as soon as 一…就…
39. The manager lost his _B_ just because his secretary was ten minutes late.
A mood B temper C mind D passion
lose one’s temper 发脾气。
40. Great as Newton was, many of his ideas _C_ today and are being modified by the work of scientists of our time.
A are to challenge B may be challenged C have been challenged D are challenging
as表示“尽管”时引导从句，从句中的表语可以放在引导词之前构成部分倒装。
41. Please be careful when you are drinking coffee in case you _D_ the new carpet.
A crash B pollute C spot D stain
pollute vt. 污染; spot n. 地点，场所，斑点，污点;v. 使…上有斑点、污点。
spotted dog 斑点狗。 stain v. 弄脏，玷污，染色。
59. The tomato juice left brown _A_ on the front of my jacket.
A spot B point C track D trace
42. I'd rather read than watch television; the programs seem _B_ all the time.
A to get worse B to be getting worse C to have got worse D getting worse
all the time 始终，一直。
43. Convenience foods which are already prepared for cooking are _D_ in grocery stores.
A ready B approachable C probable D available
convenience foods 方便食品; instant coffee/noodle 速容咖啡/速食面。
ready adj. 准备好的; approachable adj. 可接近的，平易近人的，亲切的。
probable adj. 可能的; available adj. 可获得的，可利用的，可支配的。
44. When I caught him _A_ I stopped buying things there and started dealing with another shop.
A cheating B cheat C to cheat D to be cheating
45. It is important that enough money _A_ to fund the project.
A be collected B must be collected C was collected D can be collected
46. Some old people don't like pop songs because they can't _C_ so much noise.
A resist B sustain C tolerate D undergo
tolerate vt. 忍受，容忍; undergo vt. 经历，遭受。
48. _C_ one time, Manchester was the home of the most productive cotton mills in the world. [at one time 曾经，一度]
A On B By C At D Of
49. _A_ it or not, his discovery has created a stir in scientific circles.
A Believe B To believe C Believing D Believed
believe it or not 信不信由你。 creat a stir 引起轰动。
50. Mr. Morgan can be very sad _C_, though in public he is extremely cheerful.
A by himself B in person C in private D as individual
in public 在公众面前; in private 私下单独一个人的时候。
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