What are the keywords in the following sentence? Sheep grazing on a green hillside in the grass with trees and small hills in the distance.
grass, graze, sheep, tree

What are the keywords in the following sentence? chairs and umbrella on a beach
beach, chair, umbrella

What are the keywords in the following sentence? A group of people covered in sheets are dancing and singing using puppets.
cover, puppet, sheet

What are the keywords in the following sentence? one of many cargo ships waiting to dock .
dock, ship, wait