P42.Using Words And Expressions 1. In the twenty-first century, educated people find it difficult to believe that living conditions in the nineteenth century ________ people _____ serious illnesses. The reports of many doctors _______ illness _____ drinking polluted water. However, one hundred years ago people did not connect a disease to the environment. So they did not _______ the companies that supplied dirty water. The doctors found that the dirtier the water, the more ______ the illness. It was only later when people began to _______ the water and _____ its quality that they_______ the idea that cholera was _________ from the air. It was only when everybody began to attack the dirty conditions that cholera was _________ and was not a problem any more.

expose

examine

severe

blame

to

link

to

absorbed

rejected

test

defeated