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1. Public transport in London is expensive. The fare depends on the   of the journey; you can not buy books of   in advance. Children under sixteen pay half and those under five travel  , you usually buy bus tickets from a conductor. But on some buses you pay the driver. Most London buses are double deckers.
On the underground railway (or tube) you buy your ticket from a ticket office, and give it up at the end of the  . Not all trains from one station go to the same place, so watch the signs. The last   leaves at about 00.15.