According to the context, the correct word that best completes the sentence is "gimnasio", Jugamos el baloncesto en el gimnasio.
It is that space specially created so that various types of physical activities are carried out in them.
Basketball (baloncesto) is a sport whose objective is to introduce the ball in the hoop and can be played by young people in a closed gym (gimnasio cerrado).
Therefore, we can conclude that according to the context, the correct word that best completes the sentence is "gimnasio".
Learn more about a gym here: https://brainly.com/question/20891555