Do not catch frogs

On Sunday, my sister and Xiao Ming went to Jade Belt Park to play. There are so many people in the park! Some of you sit on the green grass to read books, some exercise on fitness equipment, and some play in the clear river. Xiao Ming saw a frog by the river and ran to catch it. The sister saw and said, "Don't catch a frog. The frog is our friend. It eats pests." Xiao Ming said: "I immediately put it." They put the frog and played happily.