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Without the video or more information it's very difficult to help you out.
1-Es.
2-Tiene.
3-Somos.
4-Tengo.
I would say Dominican Republic only because I am Dominican and my parents call my room a dormitorio, a dorm. I’m not sure how the passage can make it clear where he lives though..
Answer:
es
Explanation:
the boy_es__ fifteen years
