选择题：Americans love their cars. When gas was _1_, Ameri

Americans love their cars. When gas was _1_, Americans drove everywhere, even to buy something at a store two or three blocks away. On Sunday’s many families got into the car and went for a drive for an hour or two. _2_, many Americans have been changing their ideas about _3_. Today _4_walk or ride a bicycle to the store, and people think twice before they go for a drive on Sunday.
Today Americans are worried about saving energy in their homes, too. Before OPEC raised oil price, the typical American home and office building was too warm in the winter and too cool warm in the summer. Since 1973, Americans have been more careful with _5_. Many families _6_the heat to 15℃ at night and 18℃ during the day. Perhaps because of this, companies that make long underwear have been doing very well since 1973.
People _7_ everywhere to find ways to save heating oil and electricity. Many people have been buying old-fashioned stoves so as to burn wood. Most people have been more careful to _8_ electric lights. For several years the government has been giving tax money back to people when they improve their homes to save energy. For example, when people spend money to put new and better windows on their houses, the government returns some of their tax money.
Americans don’t like to give up their big cars, warm homes, and air conditioning, but _9_ the high price of oil, they _10_.