Final answer:
The correct word to complete the sentence is le.
Step-by-step explanation:
The correct answer is le.
In this sentence, 'A mi amigo' is the subject and 'les gusta vivir en las afueras de la ciudad' is the predicate. The subject is singular, so the correct pronoun to complete the sentence is le, which means 'to him' or 'to her' in Spanish.
Example: A mi amigo le gusta vivir en las afueras de la ciudad. (My friend likes to live on the outskirts of the city)
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