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ll water supplies __ ______. Finally , “King Cholera was defeated”. doctor cure cause theory pump marked collect examined supporting evidence be Stage 4 postreading Step10 Discussion Task8 Read the passage again and fill in the blanks. Do you think John Snow would have solved this problem without the map and why? No. The map helped John Snow anize his ideas and provide him valuable clues. After he collected information and marked the information on the map, he would clearly know the position where all these dead people lived and where there were no deaths, and then he came up with the idea to check their drinking water and thus he reached to the key point. Stage 5 Homework Step11 Discussion Task9 Discuss in a group of 4 and report your own experiments and try to follow the 7 stages. Find a problem Make a question Think of a method Collect results Analyse the results Find supporting evidence Draw a conclusion 。