What are the keywords in the following sentence? yellow corn field with blue sky at the end of summer
field, sky, summer

What are the keywords in the following sentence? an astronaut drifting in space is rescued by a space shuttle orbiting earth
astronaut, earth, orbit, rescue, shuttle

What are the keywords in the following sentence? person shouts slogans as police stop them during a protest against country .
police, protest, shout, slogan

What are the keywords in the following sentence? artificial christmas trees and decorations for sale in a shop
decoration, sale, shop