Tofu is  kind of popular food in China. Here is one of the (story) about how it was invented.

    In the Han dynasty, there was a man  loved his parents very much. But they were old that they could only eat soft food, so the man decided (cook) some soybeans (大豆) for them. He mashed the soybeans and made them into a soup.

    The soybean soup didn't taste very  (good) in the beginning because there were too many soybean crumbs (碎屑) in it. The man took the crumbs away,  his parents still didn't like it. He thought and thought many times. At last he (add) some salt and heated it again. When the soup cooled down, it turned  a piece of jelly (胶状物).

    The man was  (surprise) by its taste and his parents loved it very much. Finally, people around the country all learned how to make tofu. And this is how tofu was invented.