Which verb correctly completes this sentence? The crowd
clapping and cheering.

A. were
B. is
C. are
D. am
E. have been

were

Explanation:

you need to post the passage so we know what you’re talking about

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).