7. He made many mistakes in his homework. He did it (careful) .

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    In common with many countries,Britain has serious environmental problems. In 1952,more than 4,000 people died in London because of the smog. The government introduced new laws to stop smog from coal fires and factories and the situation improved a lot.

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     Critics (評(píng)論家) say that Britain needs better and cheaper public transport. Transport in Britain is very expensive. An early morning train trip from Glasgow to London (about 600 km) can cost about £100,for example. A short 15-minute bus trip can cost over £l. 00.

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