Fill in the gaps.There are some extra words.

London is so large that visitors must learn to use buses and the ... to get about. London taxis are too expensive for any but the rich. You can get a map of the underground and the bus routes at any ... office. The word "Underground" across a large circle shows you where the ... are. The London underground is called the ... . Bus stops are marked clearly. In the suburbs buses do not stop unless there are ... who wish to get on or off .
These stops are marked "Request Steps".