What are the keywords in the following sentence? author and racing is given a lift back to pits by racecar driver
author, driver, give, pit

What are the keywords in the following sentence? a lonely old man looks at the sea in the first hours of the morning
look, morning, sea

What are the keywords in the following sentence? demonstrators gathered outside the site of speech .
demonstrator, gather, site, speech

What are the keywords in the following sentence? aircraft taking off on a tropical airport
aircraft, airport, take