Final answer:
The correct verb form to complete the conversation is 'tengo'.
Step-by-step explanation:
The correct verb form to complete the conversation is tengo.
The conversation is:
- Julio: ¿Qué planes tienes para mañana?
- Diego: Primero tengo que ir al museo y después a la universidad.
The verb form tengo is the first-person singular form of the verb 'tener', which means 'to have' in English.
Learn more about Verb forms in Spanish