Choose the correctly written sentence to be success successful in any field perseverance it must be maintained to achieve success in any field one must preserve to achieve success in any field perseverance it must be maintained none of the above

explanation:

the correctly written sentence is to achieve success in any field, one must persevere.

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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).