work take library should right aren't keep clean having quietly |
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 . When we are walking, we should keep to the . You can see "No" in the computer room. When we are classes, we must quietly. We obey(遵守)these rules in our life.