Final answer:
The correct form of the verb 'decir' to complete the sentence is 'decimos'.
Step-by-step explanation:
The correct form of the verb 'decir' to complete the sentence would be 'dicen'.
When talking about a group of people, such as 'Mis amigos y yo' (my friends and I), we use the pronoun 'nosotros' (we) to conjugate the verb.
So, the correct form would be 'decimos' (we say).
Learn more about Spanish verb conjugation