What are the keywords in the following sentence? a staircase with a dark wooden railings in an abandoned architectural building .
abandon, building, staircase

What are the keywords in the following sentence? cups of coffee with clock that illustrate coffee time .
clock, illustrate, time

What are the keywords in the following sentence? students work on homework during a free afterschool program .
homework, program, work

What are the keywords in the following sentence? air bubbles rise to the surface of the water
bubble, rise, surface, water