What are the keywords in the following sentence? A dinner plate holds pork, potatoes, broccoli and carrots.
broccoli, plate, pork

What are the keywords in the following sentence? A cat rests on top of a laptop and a sweater. 
cat, laptop, rest, top

What are the keywords in the following sentence? a fisherman with boat on the beach in sunset time near to the sea
beach, boat, fisherman, sea

What are the keywords in the following sentence? Two adult zebras run across an open plain.

plain, run, zebra