41. jean did not have time to go to the concert last night because she was busy _c_ for her examination.
a to prepare b to be prepared c preparing d being prepared
be busy doing sth. 忙于做某事
42. five minutes earlier， _a_ we could have caught the last train.
a and b but c or d an order
and 在这里表示一种结果，翻译成“那么（和）”。只有两种情况下and才会这样翻译：
1. 省略句 + and + 句子; 2. 祈使句 + and + 句子。
47. turn on the television or open a magazine and you _b_ advertisements showing happy balanced families.
a are often seeing b will often see c often see d have often seen
43. i cannot give you _d_ for the type of car you sell because there is no demand for it in the market.
a an expense b a charge c a purchase d an order
order n. 定购，订单; purchase n. 购买。
45. by the end of this month， we surely _c_ a satisfactory solution to the problem.
a have found b will be finding c will have found d are finding
如果一个句子的时间状语是由by引导的，则时态要选择完成时态。
将来的行为在将来的某个时间之前就已完成用将来完成时。
solution to a problem 一个问题的解决方案。
46. mr. wilson said that he did not want to _a_ any further responsibilities.
a take on b get on c put up d look up
take on 承担; take on responsibility 承担责任。
47. having no money but _b_ to know， he simply said he would go without dinner.
a not to want anyone b not wanting anyone c wanted no one d to want no one
dinner n. 正餐（多指晚餐）; supper n. 夜宵，晚餐; breakfast n. 早餐; lunch n. 午餐;
brunch n. 早午餐。[but前后的句子要平衡]
48. we desire that the tour leader _a_ us immediately of any change in plans.
a inform b informs c informed d has informed
desire v. 要求，表要求时后面加句子要用虚拟语气， （should） + 动词原形。
其他同样用法的词还有ask， demand， request， require.
49. not _b_， the process of choosing names varies widely from culture to culture.
a obviously b surprisingly c particularly d normally
not surprisingly 一点也不奇怪。 vary vi. 变化。
vary from … to … 从一种形式变化到另一种形式。vary between … and … 在两者之间进行变化。