Tom lives in the country and he likes playing in a very small river near his house. But then his family moves into a big city. On the first morning he asks his mother, "Is there a river near here?" His mother says, "No, there isn't , but there is a nice park near here, and there's a pool (水塘) in it. We are going there this afternoon. "
After lunch, Tom and his mother go to the park. Tom wants to walk near the pool, but there's a sign (牌子) in front of it. His mother reads it to him: "WARNING (警告) : This pool is dangerous. 367 people have fallen (掉) into it. "Tom looks into the pool carefully. Then he says, "I can't see them."
