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A hundred years ago, most people traveled on foot, by train, or (1) ……cái này mình chịu……………….. horseback. Railways had made it possible to travel rapidly over (2) …………far hay là big nhỉ?……………………… distances. Bicycles were also becoming popular, (3) ………………because of………………… the invention of air-filled tyres, which made cycling a lot more comfortable. Buses, trams and underground railways had already been invented, and cities all over the world already had (4) ………………had………………….. jams.
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