学进去

It is Saturday morning. Helen and _____ brother Tom are taking a walk in the park. There are lots of public signs in the park. They mean different things. Helen knows a lot _____ them. But Tom doesn’t. Suddenly Helen _____ a boy climbing the tree. She shouts at that boy. “_____ climb the tree. _____ you see the sign over there?” The boy jumped off the _____ soon. Tom pointed _____ the sign and says to Helen. “So the sign over there _____ we shouldn’t climb tree, right?”