Final answer:
The word 'hacía' should be selected to complete the sentence.
Step-by-step explanation:
The correct word to complete the sentence is hacía.
Therefore, the sentence should be: Cuando tenía siete años, yo hacía calle con mis amigas.
The word hacía means 'was doing' or 'used to do' in Spanish and fits well in the context of the sentence.
Learn more about Completing a sentence in Spanish