填空题

From 1760s onwards, there was a great change in the way people lived. Machines were (36) that could make things much faster than the old (37) did. The people left their homes and small workshops to go to the big new factories. (38) the machines drew the (39) from the countryside into the towns to find work.. This process became known as the Industrial (40) . As the people flocked into the towns, the towns grew into large, dirty and industrial cities. People lived in (41) and unhealthy conditions. The water was often polluted, there were no (42) drains or sewers, and the air was filled with smoke. (43) . The factories gave off other fumes as well as smoke, adding to the health hazards of living in the city. (44) . They fell from the air and (45) . This kind of pollution continued until the Clean Air Acts of 1956 and 1968 stopped most of it. (46)