It is a Sunday morning. There are many children in the beautiful park. They are having a good time. Some are playing games under a big tree. Some are singing and dancing. Some boys and girls are running up the small hill. Others are boating on the lake. Where is Dick ? He is sitting by the lake. What's he doing? He is drawing. Look ! What is Jane doing? She is on the grass. She is running after a nice butterfly. She wants to get it. The children are boating  _  .
on the lake in the river on the hill under the tree