What are the keywords in the following sentence? australian suburb of the most livable cities in the world
city, suburb, world

What are the keywords in the following sentence? volcanic activity under meromictic lake produced a cloud of carbon dioxide that asphyxiated villagers
activity, asphyxiate, cloud, lake, produce

What are the keywords in the following sentence? old buildings in a state of disrepair .
building, disrepair, state

What are the keywords in the following sentence? monks walking up to a temple .
monk, temple, walk