Unit 4 Don't talk here. Do not smoke! Do not talk! Do not use a mobile phone! Do not pick flowers! Do not fish! Do not spit! What do these signs mean? Guessing Game 猜谜 It’s a place (地方) There are many books. Be quite. Where is it? library library floor talk 说话 eat 吃 throw 扔 wall 墙 地板 class 课堂 Learn words: park floor road library throw waste 单词大比拼 wall class Don't talk in the library. × talk library Don't talk in class. × class talk