_18. The word unprecedented appears underlined in the excerpt. It is formed from the base word precede, meaning "come before." Choose the answer that gives the most likely definition
of unprecedented, from its base word precede.
a. frequently observed
b. everyday occurrence
c. never previously experienced
d. happening with regularity

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 means that the hockey puck was traveling very fast.

can you tell me the answers to this

the writer needs to avoid using abbreviations and check spelling before sharing.