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　　In the times of Queen Victoria people were exposed to cholera, a deadly disease. Neither its cause nor its cure 61 (understand). Once there was 62 outbreak, so many thousands of terrified people died. John Snow, a well-known doctor, who attende d the queen as her 63 ( person ) physician was appointed 64 (solve) the problem. One of the 65 (theory) said that people absorbed this disease into their bodies with meals. He suspected it was correct 66 he needed evidence. He made a map, on 67 he marked the exact places where the victims had lived. As a result, he announced with 68 (certain) that the polluted water was to blame 69 it. He suggested that all the water supplies 70 ( examine ). Thanks to John Snow, King Cholera was defeated.

　　答案

　　61. was understood 62. an 63.personal 64. to solve 65.theories

　　66. but 67. which 68. certainty 69. for 70. (should) be examined