The teacher was a real ; he marked off for every tiny error he could find, yelled at students for just looking at each other, and never accepted tardy notes. 1).demagogue 2).despot 3).enigma 4).bourgeoisie

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).