根據(jù)上下文填空。
      From London to New York, from Hong Kong to Moscow, subways (地鐵) are an i______ (1)
way of transportation. T______ (2) in modern cities is often quite h______ (3), and it can sometimes
t______ (4) hours to cross a busy city in a car or bus. Subways help s______ (5) that problem, since
they don't have to stop at traffic lights, and h______ (6) of people can take a subway train together.
In larger subway systems, such as Mexico City's, there are lines that go far away from the city c______ (7). In this way, people living in the suburbs (郊區(qū)) can take a train to work. This r______ (8) the
traffic e______ (9) and leaving a city. It also helps stop air pollution, a big problem in many cities.
Finally, subways are usually c______ (10). Basically, in a city with a subway, everybody wins!
1. important   2. Traffic     3. heavy       4. take     5. solve
6. hundreds   7. center      8. reduces     9. entering  10. cheaper
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