Answer:
Quién
Explanation:
Process of elimination. If the second line says "It's me, dad. Roberto." Then "who" would sound better than, "when", "what", or "where".
La mochila es de roberto.
Answer:
What is the question to this problem?
estudia
estudiamos
estudias
estudio
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corren
corréis
corre
corremos
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escriben
escribes
escribimos
escribís