How can the note-taker tell where everyone is from? he is a policeman and has files on all of them, he is psychic, he can tell by how they speak, it is a trick; he has it all written down

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).

it can make them lose love for themselves