What are the keywords in the following sentence? the sun forcing its way through clouds over a city
city, sun, way

What are the keywords in the following sentence? Orange train on tracks traveling through hilly woods.
track, train, travel, wood

What are the keywords in the following sentence? aerial night view of skyscraper and illuminated windows in a modern city .
city, illuminate, skyscraper, view

What are the keywords in the following sentence? A green apple on top of some oranges
apple, orange, top