What are the keywords in the following sentence? cave where lovers carved they names on the stone wall
carve, cave, wall

What are the keywords in the following sentence? elephant is practicing for the circus while a man watches
circus, elephant, watch

What are the keywords in the following sentence? Two women are discussing politics while standing.
discuss, politic, stand

What are the keywords in the following sentence? these minerals make up most of the rocks found in crust .
crust, find, rock