What are the keywords in the following sentence? The zebra is eating grass in the sun.
eat, grass, sun

What are the keywords in the following sentence? education of students in an elementary classroom
classroom, education, student

What are the keywords in the following sentence? conceptual royalty free stock image of a businessman carrying the world on his shoulders .
businessman, carry, image, world

What are the keywords in the following sentence? home at his estate which is for sale .
estate, home, sale