What are the keywords in the following sentence? students had their achievements recognised at ceremony .
achievement, ceremony, student

What are the keywords in the following sentence? Some guys are outside in a wrestling or boxing ring and an announcer is giving commentary.
announcer, commentary, ring

What are the keywords in the following sentence? Snowboarders dressed in full gear on a snowy hill in the midst of a dreary day.
day, hill, snowboarder

What are the keywords in the following sentence? traffic passes over cantilever bridge on a foggy morning
morning, pass, traffic