act behavior conduct
Professor Williams lived alone and he was very  absent-minded  .He used to arrive at the university to give a lecture and find that he had forgotten to bring his notes.Or he would lose his spectacles and be unable to see the  blackboard  .He could never find any chalk to  write  with,and he often forgot the time and would ramble on for hours because he had  1eft  his watch at home.But the most  amazing  thing of a11 about him was his  [MASK]  .His overcoat was rarely  fastened  ,as most of the buttons were  missing  .His shoes were usually untied because he had lost the laces.He must have lost his comb as well because his hair was always standing on.His trousers were  held up  by an old tie instead of a belt.He was a chain smoker.He would smoke  even  in class.Cigarette ash was liberally scattered over his waistcoat.