What are the keywords in the following sentence? hundreds of graduates sit inside stadium during the annual graduation ceremony .
ceremony, graduate, sit

What are the keywords in the following sentence? military regiment lead the parade through a city .
city, parade, regiment

What are the keywords in the following sentence? tree near a forest lake in nature reserve gnawed at by a beaver
beaver, gnaw, tree

What are the keywords in the following sentence? this man is travelling to every country in the world without ever getting on a plane
plane, travel, world