When I have to relief classes of other lecturers, I usually find that the lclassess in need of some dusting and sweeping. This happened to one of the classes I was in last week, there were pieces of paper on the floor and some of the rubbish had spilled out from the waste paper basket. I told the students to put their chairs on the desks and to go stand in the corridor while those who were on duty that day did the cleaning.
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