（2017 全国Ⅱ） In 1863 the first underground passenger railway in the world opened in London. It ran for just under seven kilometers and allowed people to avoid terrible __61__(crowd) on the roads above as they travelled to and ________62__work. It took three years to complete and was built using an interesting method. This included digging up the road, ____63___(lay) the track and then building a strong roof over___64___ top. When all those had been done, the road surface was replaced. Steam engines ___65__(use) to pull the carriages and it must have been___66__(fair) unpleasant for the passengers, with all the smoke and noise. However, the railway quickly proved to be a great success and within six months, more than 25,000 people were using___67__every day. Later, engineers ____68___(manage) to construct railways in a system of deep tunnels (隧道）, which became known to the tube. This development was only possible with the___69___ (introduce) of electric-powered engines and lifts. The central London Railway was one of the most ___70___(success) of these new lines, and was opened in 1900. It had white-painted tunnels and bright red carriages, and proved extremely popular with the public. 

答案及解析：

61. crowds人群。  terrible作为形容要修饰名词，跟crowd相关的名词。

62.from 来自。 和前面的to 相呼应。

63.laying平放。 并列的几个动词形式一致。

64.the 冠词。 介词与名词之间需冠词，特指。

65.were used 被用来。 理清主语与动词的关系，主动还是被动，看时态与数。

66.fairly非常的，很。 副词才能修饰形容词或副词，所以要变成副词形式。

67.it它。 指代前文中的railway.

68.managed 设法。注意主被动和时态。

69.introduction 说明，引进。the 的后面应该用名词。

70.successful成功的。 the most 后面只能是形容词或副词。根据前后文，用形容词。