What are the keywords in the following sentence? Chairs and umbrellas set out on a nice beach. 
beach, chair, set, umbrella

What are the keywords in the following sentence? a city looms large on a hillside at the end of the main central road
city, hillside, road

What are the keywords in the following sentence? floor to ceiling windows allow lots of light to flood the space
allow, ceiling, floor, space, window

What are the keywords in the following sentence? back side view of woman looking at shark and different fishes at the big aquarium and touch it

aquarium, fish, look, shark