Final answer:
The verb that best completes the sentence is 'hablábamos'.
Step-by-step explanation:
In the sentence, the verb that best completes the sentence in the correct form and tense is hablábamos. The subject of the sentence is 'mi amiga y yo', which is in the first person plural form. The verb 'hablábamos' is also conjugated in the first person plural form, indicating that both the speaker and their friend used to talk about their favorite stories in their childhood.
Learn more about Verbs and conjugation in Spanish