Once upon a time, a little {caterpillar} named Max lived on a leaf. Max loved to eat green leaves. He ate all day and grew bigger. Max's life was simple but enjoyable. One day, he felt sleepy and built a {cocoon     } around himself. After a few days, he emerged as a beautiful {butterfly  }. He spread his colourful wings and flew. Max's life had {transformed}. He was no longer a caterpillar, but a beautiful butterfly.