What are the keywords in the following sentence? learn the art of this traditional form of dance in poster
art, dance, form

What are the keywords in the following sentence? schoolboy sits at a desk at school classroom
classroom, schoolboy, sit

What are the keywords in the following sentence? The man is skateboarding on the sidewalk in the city.
city, sidewalk, skateboard

What are the keywords in the following sentence? Cattle graze in a green valley below a hill.
cattle, graze, hill