What are the keywords in the following sentence? A train that is on the tracks on a rail.
rail, track, train

What are the keywords in the following sentence? bar and organisation in action during day
action, day, organisation

What are the keywords in the following sentence? beautiful trees in bloom against a blue sky
bloom, sky, tree

What are the keywords in the following sentence? a variety of exotic edible mushrooms are offered for sale at a food market
market, mushroom, sale