What are the keywords in the following sentence? horses grazing above a farm in autumn
autumn, farm, horse

What are the keywords in the following sentence? construction a new garden around existing elements such as this large elm tree .
exist, garden, tree

What are the keywords in the following sentence? religious leader holds a crucifix as he celebrates western christian holiday of the lord mass .
celebrate, hold, mass

What are the keywords in the following sentence? a large plane is docked at the airport and connected

airport, dock, plane