完形填空。
Mary loves swimming. Every Sunday she has a1lesson with ten 2girls and boys. Their mothers and fathers come 3 them swim because the children are only one or two4old!
When Mary began taking lessons, she was six months old. Now she is one year5and a good swimmer. She can6across the pool and even float on her back. Some people are afraid7the water. Not the children8 Mary's class! They think that swimming9a lot of 10.