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An escalator can move between(7) ________ 8,000 and 9,600 people an hour and it does(8) ____ not need a person to operate it. Towards the end of the nineteenth century, cities were (9)becoming ________ more crowded and the first escalators were built at railway stations and in big department (10)stores _____ so that people could move about more quickly. Today we see escalators everywhere.
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