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Once there was a king and his daughter. The king asked his daughter how much she loved him. She said that she loved him as much as the loved ______. Her answer made the king very happy. Salt is simple thing, ______ it is very important. So the king thought his daughter cared a lot about him.

Salt has many______. Bodies need salt. If we don’t have enough, our bodies can’t work properly. We put salt on icy roads to make them ______.   We also use salt to produce other products, like paper and glass. But for many years, salt’s most important job was to ______ food. Like other living things, most bacteria(细菌) need water to live. Salt takes in plenty of water, so most bacteria(细菌) can not live _______a salty environment. As a result, salt protects food and many other things. For much of humans history, this ability has made salt _______ Every ancient culture from Egypt to China depended on salt. Even today, the hard working useful people are ______ as “the salt of the earth”.

For centuries, salt was also hard to   ______. It’s usefulness, together with rarity(稀有) made it very expensive. Salt could even be used like   ______. In fact, the word salary (薪水) comes from the word salt.

Today, salt is used more widely and it still plays an important role in our life.