What are the keywords in the following sentence? An airplane sits on the tarmac of an airport, with a disconnected boarding gate.
airplane, airport, gate, sit

What are the keywords in the following sentence? A hotdog with ketchup, mustard, and relish.
ketchup, mustard, relish

What are the keywords in the following sentence? A plate mounted to a wall next to a cat clock with crazy eyes.
clock, plate, wall

What are the keywords in the following sentence? student studying at the library
library, student, study