What are the keywords in the following sentence? the referee called the ringside doctor into action after the ninth round
action, referee, round

What are the keywords in the following sentence? trees growing inside a crater
crater, grow, tree

What are the keywords in the following sentence? nothing beats the comfort of finding your home away from home .
comfort, home, nothing

What are the keywords in the following sentence? people raise chickens to keep a steady supply of eggs .
chicken, egg, raise