Final answer:
The correct form of the verb 'comer' to fill in the blank is 'comes'.
Step-by-step explanation:
The correct form of the verb comer to fill in the blank in the question is comes. In Spanish, the subject 'Ud.' is the abbreviated form of 'usted,' which is the formal second-person singular pronoun. The conjugation of the verb 'comer' for 'Ud.' is 'comes'.
Learn more about Spanish verb conjugation