What are the keywords in the following sentence? flowing waterfalls are a rare sight in summer .
flow, sight, waterfall

What are the keywords in the following sentence? A zebra and two elephants are on a grassy field.
elephant, field, zebra

What are the keywords in the following sentence? storm clouds in bad weather over rough sea with breaking waves off the coast
coast, storm, weather

What are the keywords in the following sentence? pin long shadow glyph icon .
glyph, icon, shadow