What are the keywords in the following sentence? a boy watches a giraffe at a zoo
giraffe, watch, zoo

What are the keywords in the following sentence? A pair of men, one the pilot, the other the copilot, fly a plane
copilot, fly, pilot

What are the keywords in the following sentence? Bathroom featuring a round window and tiled flooring
bathroom, feature, tile

What are the keywords in the following sentence? Over them is heard the noise of the train coming into the station and its lights are seen.
come, hear, train