What are the keywords in the following sentence? observation tower breaks through the clouds on a foggy morning in the city
city, cloud, morning

What are the keywords in the following sentence? map from which users can select the district in which they want to browse hospitals .
browse, hospital, map, select, user

What are the keywords in the following sentence? A row of people on horses next to a building.
building, horse, row

What are the keywords in the following sentence? Then he turns and runs out to the sidewalk, until his face fills the screen.
face, fill, screen