In China, there are always many interesting stories about inventions. Chopsticks are one of （important） inventions in Chinese history. Do you know the story behind the chopsticks? Let me tell you.

    According a famous story, Dayu, the Emperor of the Xia dynasty, was the person invented chopsticks. At that time there was a flood in China. Yu was very  （worry） about his people and the flood. And he tried his best （find） some ways to control the flood.

    One day, he was having his lunch at home  someone came and told him that the flood was coming again. He stopped （eat） and set out at once. He was hungry and wanted to pick up some meals on the table to eat （quick）. But the food was hot to pick up with hands. Then he used two branches（树枝） from a tree to pick up the food. They were the （one） pair of chopsticks.