What are the keywords in the following sentence? island seen from a passing boat
boat, island, pass

What are the keywords in the following sentence? Someone exchanges a glance with someone and follows her.
exchange, follow, glance

What are the keywords in the following sentence? bear grass and grape along the trail .
bear, grass, trail

What are the keywords in the following sentence? Butter is being spread on a piece of bread and then Turkey and cheese is being topped off.
bread, piece, spread