What are the keywords in the following sentence? it's a hot day so this girl decided to cool off in the fountain
cool, day, decide

What are the keywords in the following sentence? fresh tuna lies awaiting inspection and auction the worlds largest daily fish market
auction, lie, market, tuna, world

What are the keywords in the following sentence? flags were seen flying at half mast from the roof this evening in honour of person
flag, fly, mast, roof

What are the keywords in the following sentence? The train is traveling form the city, and has arrived at the junction of several tracks.
junction, track, train