阅读下面短文，选择合适的单词将短文补充完整，使其意思通顺，合理，将序号填在横线上。

A. eating      B. work      C. take    D. library    E. should F. right      G. quietly      H. aren't    I. keep

There are some public(公共的) rules(规则)in our life. They mean different(不同的) things. When we are in the , we must talk . When we are waiting for the bus, we should turns. When our desks clean, we must our desk clean. When we are walking, we should keep to the . You can see "No "in the computer room. When we study in class, we must quietly. We obey(遵守)these rules in our life.