What are the keywords in the following sentence? speed boat cruising on the lake
boat, cruise, lake

What are the keywords in the following sentence? ancient map ofa city with the tribes .
city, map, tribe

What are the keywords in the following sentence? miners working at the mine with an engineer
engineer, mine, miner

What are the keywords in the following sentence? a view of a city across a river in winter
city, river, view, winter