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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。
关于逗号的一些知识
原则：逗号没有能力连接两个单独的句子。
如何区分短语与句子?一个结构如果有完整的谓语部分就是句子。
何为完整的谓语部分?如果能判断出一个结构的时态就可以称这个结构为完整的谓语部分。
在什么样的情况下一个逗号可以将句子分成两部分，而这两部分都有完整的谓语呢?
1 两个句子中间有连接词连接;
2 这两个句子是主从句关系（主从句之间一定要有句子引导词来引导）。
10. walter offered us a lift when he was leaving the office， but our work _a_， we declined the offer. [declined v. 婉言谢绝]
a not being finished b not having finished
c had not been finished d was not finished
42. a survey was carrie3d out on the death rate of new-born babies in that region， _d_ were surprising. [survey 调查]
a as results b which results c the results of it d the results of which
51. all flights _d_ because of the snowstorm， many passengers could no nothing but take the train. [having been canceled 这里是独立主格作原因状语]
a had been canceled b have been canceled
c were canceled d having been canceled