Final answer:
The appropriate form of the verb 'vivir' in the sentence '¿Dónde vives?' is 'vives'.
Step-by-step explanation:
The appropriate form of the verb 'vivir' to fill in the blank in the sentence '¿Dónde vives?' is vives. This form of the verb is the second person singular in the present tense. It is used when addressing one person directly.
Learn more about Verb Conjugation in Spanish