Learn to share(分享)

    One day, while I was sitting in my car in a parking area, I noticed a young boy in front of my car. "What is the boy doing?" I asked myself and looked closely. "Oh, he is ____up a coin from the ground. " When he ____ up, we saw each other ____ He was not older small than ten and was____one blue glove(手套) and One brown glove. His coat was too ____ for him.

    As he walked away, I saw his ____which were too old to wear, I rolled down my window and called him over.

    I asked him if he ____ some money. He replied, "No. That's okay. "

    The parking area was wet,   could tell that his ____ were cold because he kept moving his weight from one foot to the other, "Please,"  I held out a five-dollar bill(钞票). "It's not much, but when the money is shared, it is much more ____" I said. He look off one of his gloves and took the money from my hand. His small hand was red and cold. He smiled and went away after saying "Thank you!" to me. That smile made me____ warm in the cold winter.

化学教师在课堂上做了一个小魔术：吹气生火。只见老师用嘴通过一根细长的玻璃管对着蒸发皿中的一团棉花吹气，不一会，棉花就燃烧起来。同学们觉得很好奇：通常情况下，嘴中呼出的气体是不会使棉花燃烧的。为什么老师对着棉花吹气就能使其燃烧？
我们已经知道：可燃物的燃烧需要两个条件①____ ，②____ ；
小娟同学课下询问老师知道了其中的道理：口中吹出的气体中含有一定量的CO₂，棉花（实为脱脂棉）中包裹着黄色过氧化钠（Na₂O₂），CO₂与Na₂O₂反应生成白色的碳酸钠和氧气，同时放出大量的热，最终使棉花燃烧起来。请写出Na₂O₂与CO₂反应的符号表达式：____ 。