What are the keywords in the following sentence? soldiers from the army are preparing for a parade for day .
army, parade, soldier

What are the keywords in the following sentence? Two people boarding a plane privately as it is parked on the runway.
board, park, plane

What are the keywords in the following sentence? the only planet to have liquid water at the surface .
planet, surface, water

What are the keywords in the following sentence? politician delivers a speech to recognise country as a state
deliver, politician, speech, state