语法填空（共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卷标号为16-25的相应位置上。
Over years, I’ve been teaching children about a simple   16   powerful concept——the ant philosophy. They have an amazing four-part philosophy. First, ants never quit. They’ll climb over, they’ll climb under, and they’ll climb around. They keep looking for another way. What a neat (了不起的) philosophy it is to never quit   17  (look) for a way to get  18   you are supposed to go! Second, ants think about winter and summer. That’s   19   important attitude. You can’t be so naïve(幼稚的)as to think summer will last forever. People who have a little experience are clear about this. So ants are gathering their winter food in the middle of summer. It’s important to be realistic. You have got to think about rocks as you enjoy the sand and sun. Think ahead. The third part is   20   ants think about summer all winter. During the winter, they remind   21  , “This won’t last long; we’ll soon be out of here.” And   22   the first warm day, the ants are out. If it   23   (turn) cold again, they will dive back down. But they come out again if it is warm. They can’t wait   24   (get) out. Last, how much will an ant gather during the summer to prepare for the winter? All that it   25   (possible) can. What a great philosophy to have —— the ant philosophy: never give up, look ahead, stay positive and do all you can.

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知识点： 语法填空