请先阅读下面短文，掌握其大意，然后用方框中所给的词的适当形式填空。每词限用一次。

Many people have cars in the city. But pollution is a problem because of the 1.    . Nowadays some downtown(市中心) areas around the world don’t have cars. These car-free zones(无车区) are 2.    for people, bicycles, and public transportation only.

Eight million people 3.     in the center of London and anther two million go to work there every day. The downtown area is very 4.      with hundreds of cars, buses, and taxis, but there are 5.    a lot of beautiful parks with free music concerts. At lunchtime, many people go there for a rest 6.     they get off work.

Parts of Tokyo are always crowded with hundreds of people — but no cars! These modern car-free zones are 7.     popular and people like shopping there.

In the past, Bogota was polluted because there 8.     lots of cars and traffic. Now the downtown area is a car-free zone and the air is 9.     ! Many people don’t have a car and half a million people take the bus 10.      . There are lots of stores. It’s not expensive.

答案

1.traffic 2.areas  3.live  4. noisy 5. also 

6.after  7. really  8.were  9. clean 10. to work