The first underground system was proposed by Charles Pearson in 1843. Twenty years later the first line of the London Underground was opened for traffic. In the early days, the trains were driven by steam locomotives, which burnt coal, filling the tunnels with smoke. It is said that the train staff and porters asked for a permission to grow beards and moustaches – as an early form of smog mask. The tunnels of the first underground were made as small as possible in order to reduce the construction costs. According to Pearson’s project, all lines were laid down close to the ground surface. The first escalator was also installed in theLondon Underground in 1911. The railways were prepared for any emergency that might occur. To minimize the danger of flooding the underground near the Thames, isolating doors were built in the tunnels. All the trains were equipped with special reduced lighting for using on open sections of track.
1) By 9 p.m. yesterday she __had done_ her homework. (to do) 2) At 5 o’clock yesterday she_was playing_ the piano. (to play) 3) Father _had come_ home by 6, and at 7 he _was having_ dinner. (to come, to have) 4) When I _met_ Tom, he was eating_ an ice-cream which he had bought_ at the corner of the street. (to meet, to eat, to buy) 5) When father_came_ home, we _were cooking_ the mushrooms. (to come, to cook) 6) By 2 o’clock yesterday the teacher _had examined_ all the students. (to examine) 7) On my way to school I __remembered_ that I had left_ my books at home. (to remember, to leave)
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