Final answer:
The correct verbs in the past tense to complete the sentence are 'comíamos' and 'llegamos'.
Step-by-step explanation:
In the sentence, the correct verbs in the past tense to complete it are comíamos and llegamos.
Nosotros comíamos en el restaurante mexicano cuando llegamos mi hermano.
The verb 'comíamos' is in the past tense and agrees with the subject 'nosotros' (we) in Spanish. The verb 'llegamos' is also in the past tense and matches the subject 'nosotros'.
Learn more about Past tense verbs in Spanish