What are the keywords in the following sentence? footballer says goodbye to the fans for final time
fan, goodbye, say, time

What are the keywords in the following sentence? Several zebras eat the green grass in the pasture.
eat, grass, pasture, zebra

What are the keywords in the following sentence? One of the robotic explorer shines its lights on the rotted remains of a grand piano.
explorer, light, piano, remain, shine

What are the keywords in the following sentence? a variety of exotic edible mushrooms are offered for sale at a food market
market, mushroom, sale