What are the keywords in the following sentence? the best places to buy trees
buy, place, tree

What are the keywords in the following sentence? series of small waterfalls flowing into a large green lake
lake, series, waterfall

What are the keywords in the following sentence? A couple of guys enter rowboats for a day of adventure in Mexico.
couple, day, enter

What are the keywords in the following sentence? the damage caused by high winds saw many residents having trees uprooted .
cause, resident, tree