Do you know why an underground system was first develop...

问题详情：

Do you know why an underground system was first developed in London? That is  61   most railway tracks did not go into the London city centre, so buses were required. This increased traffic on the road. The underground system transported more people without 62 （increase)traffic on the road. It was63 (say)that the first part of the underground system opened in 1863. But at that time the carriages did not have windowsand 64(pull) steam engines through narrow tunnels.  65 ( improve )the underground, Charles Yerkes bought many of the different lines and build the Underground Group. During World War II, the underground  functioned  as a bomb shelter, an aeroplane factory, an anti-aircraft centre and meeting rooms for the government   66(administrate). After World War II,  67  lines were added because more people traveled on the underground.   68helped make the system more user-friendly. 

     The London underground system is working to transport huge  69 (number) of people as it has done many years and over three million people travel on the underground system today?Visit our ticket office 70 buy one of travel cards that permit yo  travel all over the underground system.

【回答】

use    easing    said    pulled    improve    nistration 

    h            ers 

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