What are the keywords in the following sentence? butterfly on a wild pink flower in natural meadow
butterfly, flower, meadow

What are the keywords in the following sentence? gothic structure with the tower known as a city
city, structure, tower

What are the keywords in the following sentence? a group pf railway construction workers fixing a section of railroad track.
fix, section, worker

What are the keywords in the following sentence? the sunrise colors the storm clouds passing over the mountains along lake
color, lake, mountain