Final answer:
The correct form to fill in the blank is 'gusta' which means 'like' in Spanish.
Step-by-step explanation:
The correct form to fill in the blank is gusta.
The verb 'gustar' is used to express likes and dislikes. When talking about something singular, the form 'gusta' is used. For example, 'Me gusta el chocolate' means 'I like chocolate'.
Learn more about gustar in Spanish