What are the keywords in the following sentence? blooming canola field on the blue sky
bloom, field, sky

What are the keywords in the following sentence? A train leaves a tunnel surrounded by a forest.
forest, train, tunnel

What are the keywords in the following sentence? stairs lead down to bedrooms and the second bath
bath, bedroom, lead

What are the keywords in the following sentence? the image of local train and commuters at station building or station
building, image, station