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has changed is changed changes changed
to be built, ones being built, one built, ones built, those
taking to take take taken
To show how American society has changed. To compare two different ways of American life. To tell the meaning of the American people's attitude towards life style. To prove that modern life is better than the life in the past.
invents invented is invented was invented
they meet a lot of people from different places they have such useful classes in the hostel as they don't have in schools they have more interesting activities than at school they are very much interested in life in the hostel
invents invented is invented was invented
编辑电传文件发送到RCC 查出LES电话号码，给LES打电话 按住“DISTRESS”按钮5s 均不正确
invents invented is invented was invented
solve the problem of being short of fuel bring down the cost of daily life reduce the pollution of our capital keep up with the development of modern society
invents invented is inventing was invented
taking to take take taken
increased; because improved; because of raised; thanks to risen; thanks for
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