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John Snow was 1.____ expert doctor in London in the 19th century. At that time a lot of people were infected with cholera and died , so he was 2. ____ (determine) to find the cause of it so that he could help those3.____ (expose) to it .He began to gather information when another outbreak hit London in 1854. He marked on the map the exact places 4.____ the dead people had lived and found that most of5.____ (die )were near a water pump .After careful investigations John Snow announced6.____ certainty that water 7.____ (carry ) germs was 8.____ (blame) for the spreading of cholera . In order to prevent this 9.____ (happen) again , he suggested that the source of all the water supplies 10.____ (examine) and instructed the water companies not to allow people to drink the polluted water any more . At last “King Choler” was defeated .

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