Last Saturday Lin Tao and his fiends went for a picnic near a river. They had a good time preparing and sharing delicious food for lunch. After lunch, they sang, danced, played games and took photos under a tree. Then they took a walk along the riverside. They saw the running water was clean and clear. They could even see fish swimming in it. They felt very excited. One of them suggested having a swim in the river. Lin Tao thought for a while and said to his friends, “No, we can't swim in the river. It's dangerous." Though his friends were a little bit unhappy with his words, they all agreed with him. They decided to go for a swim in the swimming pool the next Sunday.