Nosotros _________ con la maestra.
Translation:
We [blank] with the teacher.
The options:
hablaré - "[I] will talk"
hablarás - "[you] will talk" (informal)
hablaremos - "[we] will talk"
hablarán - "[they] will talk"
The subject is first-person plural ("we"), thus the correct answer is hablaremos.
Answer:
Nosotros hablaremos con la maestra.