Audio Index: 33:04

Topics: Ask an American: Commuting; start versus begin versus start off versus start on; a place to live versus a place to live in; might-have-been

Words:

congestion

central

public transportation

to switch over to

gradually

rush hour

peak

in excess

air pollution

fuel

emissions

pollutant

air quality

to start

to begin

to start off

to start on

a place to live (in)

might-have-been