According to the context, the Spanish word that best completes the sentence is "la ventana".
It is an opening left in a wall to allow light to enter and ventilation.
In the sentence "Podemos mirar por la ventana y ver el sol", "la ventana" is correct since it allows the observation of the sun illuminating the place.
Therefore, we can conclude that according to research, the Spanish word that best completes the sentence is "la ventana".
Learn more about Spanish words here: https://brainly.com/question/10645482
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