Final answer:
The correct verb to fill in the blank is 'estoy', which means 'I am' in English.
Step-by-step explanation:
The correct verb to fill in the blank in the sentence 'muy cansada hoy. Yo ___' is estoy, which means 'I am' in English.
So the complete sentence would be 'Yo estoy muy cansada hoy', which translates to 'I am very tired today' in English.
This sentence is in Spanish, which is a world language studied by students in middle school and beyond.
Learn more about Verb conjugation in Spanish