What are the keywords in the following sentence? skyscraper was built and is one of the tallest buildings in the world
build, building, world

What are the keywords in the following sentence? boxer looks to throw a punch against boxer during the fight .
boxer, fight, punch, throw

What are the keywords in the following sentence? an old run down bridge crossing a lake
bridge, cross, lake

What are the keywords in the following sentence? smoke from a burning building fills the sky on the outskirts .
building, burn, fill, outskirt, sky