13．
| work travel around run million heavy |
I was born in New York.It is a very large city with 8（1）
people.How do so many people move about the city on their way to work and school？So，we should know something about its transport（交通）.
In New York you can（2）
the city by underground，bus，taxi and car.The underground（3）
on the railroad lines under parts of the city.It is the fastest way to get around the city.The second way to travel around the city is by public bus.It is a slower way to travel.This is because the traffic is often（4）
.During the morning and afternoon，there is the"rush hour".This is the time when the traffic is very heavy with people going to and from（5）
.
