What are the keywords in the following sentence? a beverage filled mug and two cookies on a plate
beverage, fill, plate

What are the keywords in the following sentence? A train is pulling cars across a bridge.
bridge, car, pull, train

What are the keywords in the following sentence? part of the old city walls around a city .
city, part, wall

What are the keywords in the following sentence? one of many cargo ships waiting to dock .
dock, ship, wait