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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:_______