What are the keywords in the following sentence? smoke from a burning building fills the sky on the outskirts .
building, burn, fill, outskirt, sky

What are the keywords in the following sentence? art gallery is a museum of medieval art
art, gallery, museum

What are the keywords in the following sentence? penta flowers with a butterfly resting on top of them
butterfly, flower, top

What are the keywords in the following sentence? fruit and flower of a vine found growing wild in the highlands .
flower, grow, vine