Emma liked to help Grandma in her garden. She was1in all the things in the garden and always had lots of questions to ask.

"Why do you have big rocks in your garden, Grandma?" Emma asked 2 she was watering lettuce. Grandma was doing some digging. "Keep your eyes open," she said. "One day you will see3."

Emma looked at the rocks every time she 4Grandma's garden. They just sat there, as if they were waiting 5her to find out their secret.

One morning Emma went into Grandma's garden to6tomatoes. It rained the night before, so it was a bit 7. But now the sun was shining warmly. 8Emma stopped and looked. On a big rock near her9two beautiful yellow-and-black butterflies. As Emma watched, the butterflies were ready to fly, and soon they flew away. Emma looked closely at the rocks. But they looked10special. Emma touched one. She smiled. She picked the tomatoes quickly and ran back into Grandma's house.

"I know why you have big rocks in your garden, Grandma!" she called. Grandma laughed. "This cool morning gave you the answer, 11it?" she said. "Yes, "said Emma. "I saw butterflies sitting on the rocks, warming 12 so they could fly. ""That's it, "said Grandma. "They can't fly when their bodies are cold. ""I wonder13they know the sun warms the rocks," said Emma. "14mystery!" said Grandma.

Emma laughed. "I'll have to work on that one, "she said. "But I know one thing, Grandma. When I grow up, I'm going to have a garden just like15. And it will have lots and lots of butterfly rocks!"