My 4-year-old son, Justin found a caterpillar (毛毛虫) and put it in a box. Each day, he ________ it fresh grass and leaves. In a few weeks, the caterpillar became fat and was ready to sleep. One morning we found it had ________ a cocoon (茧).

Justin was ________. He knew a moth (飞蛾) or butterfly was about to be born.

“Dad! ________ is happening. Come and look!” He shouted happily. We could clearly see the wings ________. A few days later, a beautiful black moth broke free from its cocoon.

The next day, Justin took the box outside, opened it, and the little moth flew out. It flew around the yard twice, ________, and landed on Justin’s arm. He picked it up and threw it in the air, ________ the moth came back again. He tried over and over to set it free, but each time it would return to his arm. It was afraid to ________ comfortable places and situations. It wanted to stay with something familiar and was afraid to move on and experience new things.

I was once that little moth. My cocoon was my mother’s love which made me comfortable like the moth, I didn’t want to fly too far from it. When my first job required me to move to a new city, I was afraid but later I chose to move there. And finally, I found I was happy about my ________.

Humans are animals of habit. We ________ change. However, if we don’t move, we won’t experience many new things. So spread your wings and fly.