Final answer:
The correct verb to fill in the blank is 'servo' which means 'to serve' in Spanish.
Step-by-step explanation:
The correct verb to fill in the blank in the sentence is sirvo. The sentence translates to 'I am a waiter. I serve many people every day.' In this context, 'servir' means 'to serve', which is an appropriate verb for someone working as a waiter or waitress.
Learn more about Verbs in Spanish