What do you think of the most important inventions(发明) in the world? The TV? The printing(印刷术)? 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(疾病) were common(常见) in big cities, and it was often difficult to find clean drinking water.
Animal food is another important invention. Before the invention, most animals were killed every autumn because there was not enough food for them in winter. After hay(干草) became a kind of common animal food, animals could live through the long winter.
The third great invention is glasses. Glasses help people read, write and do “close work” after the age of forty-five. Without glasses, the world would be difficult for the people above forty-five.

Important _____
Some most important inventions	The TV, the ____, the ______, the computer
Three other important inventions	Before the inventions.
The _____, one of the simplest inventions	____ ran into rivers from people’s houses.
__ were common in big cities.
It was often difficult to find ______ drinking water.
Hay, animal food	Most animals were killed in ____ because there wasn’t enough food in winter.
_____	Reading, writing and “close work” would be difficult for the people ____ than 45.