What are the keywords in the following sentence? housing estate built on the site
build, estate, site

What are the keywords in the following sentence? tribal women from state waited for their turn to perform .
perform, turn, wait

What are the keywords in the following sentence? relief depicting an expedition during the reign of monarch .
depict, monarch, reign, relief

What are the keywords in the following sentence? chemical element is number in the periodic table
element, number, table