What are the keywords in the following sentence? a tractor ploughs up a field whilst pursued by a flock of gulls
field, gull, plough, tractor

What are the keywords in the following sentence? time for quick paddle as the evening closes in on the beach
beach, evening, time

What are the keywords in the following sentence? A very large white polar bear eating whats looks like a carrot.
bear, eat, look

What are the keywords in the following sentence? members monitor crowds during new year celebrations in the borough .
celebration, crowd, member, monitor