根据句子意思，用所给单词的适当形式填空，未提供单词的，限填一词，请将答案写在答卷上。
      When Confucius and his students were walking through a large forest, they saw  old man standing under a tree, catching cicadas（蝉）with a bamboo stick. Confucius  (surprise) and asked, “How could you catch the cicadas so  (easy)? Do you have any special skills?”
      “Yes.” the old man answered. “It is difficult to catch cicadas   they are clever. If they hear the noise of the  (leaf) in the wind, they will fly away quickly. So, we must train our hands  (hold) a bamboo stick without shaking. If you can place three pellets（弹珠）on the top of the bamboo stick without falling off, catching cicadas is as easy as picking a ball   from the ground. At the same time, I have to say one can hardly make it without practicing again and again.”
      He then added, “But that is not enough. We must be good at hiding  (we) and whatever happens, we must focus our attention on them.”   (hear) this, Confucius turned to his students and said, “Whatever you do, you must love what you're doing and pay attention to it. This is what this old man   (teach) us.”