Where do firefighters work: La estación de bornberos
Where do you take a plane: El aeropuerto
Where do you find a group of houses: El vecindario
Where do you take your car to fill up before a long trip: La gasolinera
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The answer is: llamó (simple past) because it has an expression of time (a las ocho de la noche) indicating an action that concluded in the past
Paloma <u>llamó</u> a Juan <u>a las ocho de la noche. </u>
