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。
29. Features such as height, weight, and skin color _B_ from individual to individual and from face to face.
A change B vary C alter D convert
individual n. 个人，个体； individualism n. 个人主义。
44. The hope, goals, fears and desires _D_ widely between men and women, between the rich and the poor.
A alter B shift C transfer D vary
50. A man escaped from the prison last night. It was a long time _A_ the guards discovered what had happened.
A before B until C since D when
It + 系动词 + 一段时间 + before引导的句子 在…之前花费多少时间。
54. Scientists say it may be five or ten years _D_ it is possible to test this medicine on human patients.
A since B when C after D before
51. In the experiment we kept a watchful eye _D_ the developments and recorded every detail. [keep a watchful eye on 密切主意，留神]
A in B at
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