Final answer:
The verb 'gustar' is conjugated as 'te gusta' for the subject 'a ti' and the sentence means 'You like to watch television on Sundays'.
Step-by-step explanation:
The correct form of the verb 'gustar' to fill in the blank is 'te gusta'.
So the complete sentence would be:
A ti te gusta mirar la televisión los domingos.
This means 'You like to watch television on Sundays'.
Learn more about Conjugation of the verb 'gustar'