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"Cool" is a word with many meanings. Its traditional meaning is used to show a temperature that is fairly cold. As the world has【C1】______, however, the word has expanded to【C2】______many different things. "Cool' can be used to express feelings of【C3】______in almost anything. When you see a brand-name car in the street, maybe you can't help saying "It' s cool". You might think "He' s so cool" , when you see your【C4】______footballer. We all enlarge the meaning of "cool". You can use it instead of many words such as "new" or " amazing". Here' s an interesting story【C5】______illustrates the usage of the word: A teacher asked her students to【C6】______the waterfall they had visited. On one student' s paper was just the one sentence, "It's so cool. " Perhaps he thought it was the best way to describe【C7】______he saw and how he felt. But the story also proves the shortage of words and expressions. 【C8】______"cool" , some people have no words to express the same meaning. So it is【C9】______to increase our vocabulary to maintain some richness. As a popular word, "cool" stands【C10】______a kind of special language that people can accept easily. Apart from "cool" , can you think of any other words that make your life as colorful?