Final answer:
The correct form of the present participle to complete the sentence is viviendo.
Step-by-step explanation:
The correct form of the present participle to complete the sentence is viviendo.
The verb vivir means 'to live' and in this sentence, it needs to be conjugated in the present participle form.
For the verb vivir, the present participle is formed by adding the suffix -iendo to the stem viv-, resulting in viviendo.
Learn more about Present participle in Spanish