What are the keywords in the following sentence? number painted on a concrete surface
number, paint, surface

What are the keywords in the following sentence? olympic athlete serves against country during their volleyball game on the last day
athlete, country, day

What are the keywords in the following sentence? wide shot of storm clouds creeping across a golden sky
cloud, creep, sky

What are the keywords in the following sentence? the fire continued to burn after it started .
burn, continue, fire