"Cool" is a word with many meanings. Its traditional meaning is used to【C1】______ a temperature that is fairly cool. As the world has【C2】______ , the word has expanded to【C3】______ many different meanings. "Cool" can be used to express feelings of【C4】______ in almost anything. When you see a brand-name car in the street, maybe you can't help【C5】______ , "It' s cool." You might think, "He' s so cool," when you see your【C6】______ footballer. We all enlarge the meaning of "cool". You can use it【C7】______ many words such as "new" or "amazing". Here' s an interesting story【C8】______ illustrate the usage of the word: A teacher asked her students to【C9】______ the waterfall they had visited. On one student's paper was just the one【C10】______ , "It' s so cool. "【C11】______ he thought it was【C12】______ to describe【C13】______ he saw and felt.【C14】______ the story also proves the shortage of words and expressions.【C15】______ "cool" , some people have no words to express the same meaning. So it is【C16】______ to improve our word strength to maintain some【C17】______ . As a popular word, "cool" stands for a kind of special【C18】______ that people can accept easily. Except "cool" , can you think of many words that【C19】______ your life as colorful? I can. And I think they are also very【C20】______ .