51. studies show that the things that contribute most to a sense of happiness cannot be bought, _b_ a good family life, friendship and work satisfaction.
a as for b such as c in case of d in view of
contribute to 对…做出贡献。
52. he will agree to do what you require _d_ him.
a for b from c to d of
require sth. of sb. 要求某人做某事。
53. the mere fact _a_ most people believe nuclear war would be madness does not mean that it will not occur.
a that b which c what d why
fact后面要加同位语从句。
54. john seems nice person. _c_, i don't trust him.
a even though b therefore c even so d though
even so 即便如此，尽管如此。
55. i don't think it advisable that tom _a_ to the job since he has no experience.
a be assigned b will be assigned c is assigned d has been assigned
advisable后面加句子要用虚拟语气，形式为：(should)+ 动词原形。
56. _d_, a man who expresses himself effectively is sure to succeed more rapidly than a man whose command of language is poor.
a other things to be equal b were other things equal
c to be equal to other things d other things being equal
b项如果不省略if应为：if other things were equal
如果从句用虚拟语气，主句也必须用虚拟语气形式。
other things being equal 在这里是独立主格做条件状语。
57. _c_ that my head had cleared, my brain was also beginning to work much better.
a for b since c now d despite
注意以下三个后面加句子的表达形式：
1 in that 由于，因为; 2 now that 既然，由于; 3 except that 除了…之外。
59. by 1929, mickey mouse was as popular _b_ children as coca-cola.
a for b with c to d in
be popular with + 人的群体 受…欢迎。
60. because edgar was convinced of the accuracy of this fact, he _a_ his opinion.
a stuck to b strove for c stuck at d stood for
be convinced of 深信，确信; stick to 坚持; strive for 力求，拼命争取。
don’t strive for perfection. 不要凡是都力求达到完美状态。
48. it’s no use _b_ me not to worry.
a you tell b your telling c for you to have told d having told
it's no use + 动名词。 动名词的复合结构，宾格(形容词性物主代词)+ 动名词。
52. if it _a_ too much trouble, i’d love a cup of tea.
a isn’t b wasn’t c weren’t d hadn’t been
一般日常用语，用一般时。
56. she was glad that her success would ___ for the women who would follow.
a make things easier b make it easier c be easier d be easier to make
make for 导致，促成;朝某个方向前进，走向那里。
不要选有代词指代不明的选项。 a项中的things指的是境况，境遇。
60. we object _c_ punishing a whole group for one person’s fault.
a against b about c to d for