阅读下面短文，在空白处填写1个适当的单词或括号内所给单词的正确形式。
Once upon a time, there was a wise old man who had seven sons. But his sons (are) always fighting. It made some bad people happy because they wanted to cheat（欺骗）the brothers out of their(father) money.
One day, the father decided to help his sons stop(fight), so he brought them together. He tied seven chopsticks together, and said, "I will give all of my money toone who can break this bundle（捆）. "
The seven sons each tried(break) the chopsticks, but it was too hard. They agreed that it was impossible.
"Yet, my sons, " said the father, "it's actually easy to do. "
He untied the chopsticks and broke them oneone easily.
"Aha! " said his sons, "It's easy to do that way. Anyone can do it. "
The father(go) on, "As it is with these chopsticks, so it is with you, my sons. If you stick together and help each other, you will do well, and nobody can harm you. But if you fight, you will be like these chopsticks, broken weak. "
The seven sons listened (careful) and promised to stick together. They kept their promise and faced life's(difficulty) together, just as their wise father had taught them.