What are the keywords in the following sentence? some of the caves carved into the canyon walls
carve, cave, wall

What are the keywords in the following sentence? ship leaves the docks on a transatlantic voyage .
dock, ship, voyage

What are the keywords in the following sentence? football player leaves the pitch during the match .
leave, match, pitch, player

What are the keywords in the following sentence? A bathroom that has a shelf for towels and other supplies.
bathroom, shelf, supply