Children were working in factories ___ new machines were being invented., WHEN , WHILE, Many workers moved to the cities ___ the Industrial Revolution started., WHEN, WHILE, Families were suffering from poor living conditions ___ industry was expanding., WHEN, WHILE, Women and children were working long hours ___ men also worked in dangerous jobs., WHEN, WHILE, Cities were growing rapidly ___ people left the countryside., WHEN, WHILE, Workers protested ___ factory owners refused to improve conditions., WHEN, WHILE , New inventions were spreading ___ society was changing quickly., WHEN, WHILE, Life in the countryside changed ___ industrialization reached rural areas., WHEN, WHILE, People were getting sick ___ pollution increased in the cities., WHEN, WHILE, New laws were introduced ___ child labor became a serious problem., WHEN, WHILE.

WHEN or WHILE?

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