Conjugate the verb correctly please

Your best friend paul tells you that his father wants to cook panamanian ceviche, but he is missing one ingredient. how can you ask what he wants? ? usted prefiere la cebolla? ? usted quiere la cebolla? ? usted tiene la limonada? ? usted quiere la limonada?

In your own life, what are the most important benefits of studying spanish? in other words, why are you studying it? write your response in english.

La parada del autobus está esquina. a. hacia b. dentro c. debajo de