What are the keywords in the following sentence? the players huddle in the rain before football league sponsored by match .
league, player, sponsor

What are the keywords in the following sentence? Black smoke billows from a train as white smoke comes from the wheels.
billow, come, smoke, train

What are the keywords in the following sentence? passenger ferry traveling between the mountainous mainland and islands
ferry, island, travel

What are the keywords in the following sentence? football player the manager during the match at stadium .
manager, match, stadium