What are the keywords in the following sentence? Three people ski down a mountain at a ski resort.
mountain, resort, ski

What are the keywords in the following sentence? a mountain stream emerges from the high slopes of forested mountains
forest, mountain, slope

What are the keywords in the following sentence? Skateboarder slides across rail in corridor.
rail, skateboarder, slide

What are the keywords in the following sentence? football coach reacts to a non call during the first quarter against american football team .
call, coach, quarter