根据下面短文内容，在短文的空格处填上一个恰当的词，使短文完整、通顺。
“Cool” is a word with many meanings. Its old meaning is     to express a temperature that is a little bit cold. As the world has changed, the word has had many different    . “Cool” can be used to express feelings of interest in almost anything.
   you see a famous car in the street, maybe you will say, “It’s cool.” You may think, “He’s so cool,” when you see your favorite footballer. We all maximize(最大化) the meaning of “cool”. You can use it     of many words such as “new” or “surprising”. Here’s an interesting story we can use to show the way the word is used. A teacher asked her students to write about the waterfall(瀑布) they had visited. On one student’s paper was just the one sentence, “It’s so cool.” Maybe he thought it was the   way to show what he saw and felt.
But the story also shows a scarcity(缺乏) of words.    “cool”, some people have no words to show the same meaning. Can you think of many    words that make your life as colorful as the word “cool”? I can. And I think they are     very cool.