阅读理解。 The 2012 London Olympic Games are on the wa3'. You may have a nice trip in London with the help of the following information. By  underground The underground is fast and convenient. There is a station every few blocks. Underground trains run from 5:30 a.m. to 12:00 midnight. You can get to any place e   1    . By bus Travelling by bus is a good way to see the city-, especially from the top of a double-decker bus. There is always a bus stop nearby. There are special tickets for c   2 under the age of 12. 'By train Take a train to visit places outside London, like Hampton Court and Windsor Castle. You can use a Travelcard on the underground, buses and most trains. To p   3 your journey, get a map from the railwaystations, take some time to think about the places you want to visit. By taxi London's black taxis are f   4 . Many visitors to London know they are good and comfortable. They Will cost you a few pounds, though. Take ataxi once, for the experience. By b__ 5_ The 'river bus' leaves from Westminster Pier and stops at different placesbetween Westminster and Greenwich Pier. A good way to see the city from the River Thames. By car Don't drive your car in London! Car parks are very e   6 . You have to pay a special congestion charge (拥堵费) to drive your car into the city centre. By bike There aren't many good bicycle lanes in London. Cycling with a large guided group is better than r   7 alone. On foot The best way to visit the city! But look right and left before you cross a street. There are many beautiful sights waiting for you.