What are the keywords in the following sentence? Smoke billows from the train travelling down the track.
billow, smoke, travel

What are the keywords in the following sentence? cathedral is a favourite destination for tourists visiting the city .
destination, tourist, visit

What are the keywords in the following sentence? morning sky with sun the sun is continuing to slide
continue, sky, sun

What are the keywords in the following sentence? the ring has been engraved with his and her names
engrave, name, ring