What are the keywords in the following sentence? hibiscus flowers grow almost everywhere on the island
flower, grow, island

What are the keywords in the following sentence? the irons are heated by fire made of bones of dead cattle .
fire, heat, iron

What are the keywords in the following sentence? steel helmet that barely saved his life in military conflict
helmet, life, save

What are the keywords in the following sentence? camera flies near trees in the coniferous forest
fly, forest, tree