John Snow was a doctor who became 1 when thinking about helping patients. At the time when he lived, many people died of cholera. There were two theories 2 how cholera killed people, however, John Snow suspected the one thinking people absorbed the disease into their bodies with meals was correct but he needed evidence. In 1854 he found that in two particular streets the cholera outbreak was so severe that over 500 people3 to cholera died in a short time. He did the research and concluded that the water in the streets was to blame. People were 4 not to drink 5 water any more. Finally, cholera was6 .

explaining

Fill in the blank with the words that you hear.

inspired

exposed

instructed

polluted

defeated