选词填空。

    One day a snail(蜗牛)is ill. Xiyangyang goes into the snail's body to help him. But Huitailang  this. He  goes into the body of the he snail to catch Xiyangyang. Then Xiyangyang sides  white germs(细菌), and Huitailang sides with black germs. A big fight happens  white germs and black germs. Later, they know the worst(最坏的)one is yellow germs,  white germs and black germs both fight against yellow germs. In the end, yellow germs are moved(被感化). They  good with white germs and black germs, and the snail is also . The story tells  peace is very important. In the peaceful world, everyone is Nappy.