What are the keywords in the following sentence? pedestrians walking crosswalk in the city in daytime
crosswalk, pedestrian, walk

What are the keywords in the following sentence? green apple hanging off the branch in an apple orchard overlooking valley
apple, branch, orchard

What are the keywords in the following sentence? many locks at a bridge on the canal of city
bridge, canal, city

What are the keywords in the following sentence? Two Hot Dogs with ketchup are on a white plate.
dog, ketchup, plate