What are the keywords in the following sentence? new apartments being built on a construction site
apartment, build, site

What are the keywords in the following sentence? museum of the history of arts
art, history, museum

What are the keywords in the following sentence? kind doctor taking care of an old man in wheelchair .
care, doctor, wheelchair

What are the keywords in the following sentence? sale of souvenirs in the market .
market, sale, souvenir