What are the keywords in the following sentence? try an arrangement of a single type of flower
arrangement, flower, type

What are the keywords in the following sentence? a train with a smoke stack traveling along train tracks
stack, track, train, travel

What are the keywords in the following sentence? solitary tree in the wetlands against a cloudy sky
sky, tree, wetland

What are the keywords in the following sentence? professional boxer lands a punch on face as he attempts to finish the fight in quick fashion
boxer, face, fight, punch