【范文】I am on duty todayAfter school, it's my turn to on duty today, other students have to go home, I am on duty in the classroom.On duty, I'll clean the blackboard, I saw the teacher wrote a lot of words, read it again, I finished reading it again began to clean the blackboard, wipe out the blackboard to see below there are a lot of chalk dust, wipe off the chalk dust, then began to