What are the keywords in the following sentence? A highway filled with lots of traffic and two trains.
fill, highway, lot, traffic, train

What are the keywords in the following sentence? a tree and the winter is on its way
tree, way, winter

What are the keywords in the following sentence? author in action during the match against football team
action, author, team

What are the keywords in the following sentence? group of scientists reading scientific research in the laboratory
laboratory, read, scientist