What are the keywords in the following sentence? a researcher in their lab working on drug currently in trials .
drug, researcher, trial

What are the keywords in the following sentence? a butterfly has just emerged from a chrysalis .
butterfly, chrysalis, emerge

What are the keywords in the following sentence? ripe wheat ears in field ready for harvest and the rising sun
ear, field, harvest

What are the keywords in the following sentence? portrait of a crying female child while studying with her parents quarreling at home
cry, parent, quarrel