The Spanish word that best completes the sentence "Me gusta la televisión" is "mirar." Therefore, the complete sentence is "Me gusta mirar la televisión," which translates to "I like to watch television."
The sentence "Me gusta la televisión" translates to "I like television" in English. If you want to specify what aspect of television you like, you can use the verb "mirar," which means "to watch" in Spanish. So, the complete sentence is "Me gusta mirar la televisión," which translates to "I like to watch television." This indicates a preference for watching television as a leisure activity.