What are the keywords in the following sentence? i am the best handwritten with white chalk on a blackboard
blackboard, chalk, handwritten

What are the keywords in the following sentence? geographical feature category turns rainbow when the sun strikes it from certain angles
angle, category, rainbow, strike, sun

What are the keywords in the following sentence? A cyclist winning a race.
cyclist, race, win

What are the keywords in the following sentence? people watching the elephants being fed at feeding time
feed, time, watch