What are the keywords in the following sentence? a toilet attached two a green and white wall in the bathroom
attach, bathroom, toilet, wall

What are the keywords in the following sentence? A man looks out of a stopped train on a track.
look, stop, track, train

What are the keywords in the following sentence? a city packed for festival
city, festival, pack

What are the keywords in the following sentence? yellow corn field with blue sky at the end of summer
field, sky, summer