Good communication skills require a High level of self-awareness
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adding more details about the struggle rainsford experiences as he swims to the shore

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).

greet them:

buenas noches.

that is considered night time which is when "good night" is used.