What are "kapos" in Night by Elie Wiesel

The Kapos were prisoners in work camps that were put in charge of Kommandos, or work squads, and many of them were Jewish themselves. Often times, the Kapos were the cruelest of all of the camp overseers.

Explanation:

hope this help you

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).