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What do you think of the most important invention in the world? The TV? The printing? The telephone? Or the computer? A report shows that they are not the only important inventions. Here are three other important inventions.
One of the simplest inventions is the toilet. Before toilets, waste ran into rivers from people’s houses. Illnesses were common in big cities, and it was often difficult to find clean drinking water.

Important【小题1】
Some most important inventions	The TV, the【小题2】, the【小题3】, the computer
Three other important inventions	Before the inventions
the【小题4】	【小题5】ran into rivers from people’s houses
	【小题6】were common in big cities
	It was often difficult to find【小题7】drinking water
hay, animal food	Most animals were killed in【小题8】because there wasn’t enough food in winter
【小题9】	Reading, writing and “close work” would be difficult for the people over【小题10】