Which form of the verb "ser" correctly completes the sentence regarding a group's identity: "Nosotros ______ estudiantes de intercambio en la Universidad Nacional"?

Choose the correct conjugation of the verb "ser" to complete the sentence regarding character traits: "Ustedes ______ muy inteligentes y siempre ______ puntuales para la clase de español."

Choose the correct form of the verb "ser" to express possession and relationship in the following sentence: "Este libro ______ de Mario, y él ______ mi mejor amigo."

Choose the correct conjugation of the verb "ser" to complete the following sentence about nationality and identity: "Tú ______ de España, pero yo ______ de México."

Which of the following sentences correctly utilizes the verb 'ser' to describe a permanent profession or identity?

Choose the correct form of the verb 'ser' to complete the following sentence regarding time: 'Hoy _____ lunes y la clase _____ a las diez de la mañana.'