Final answer:
Lorena hopes to travel to South Korea one day, using the infinitive form of the verb 'travel'.
Step-by-step explanation:
The correct form of the verb to complete the sentence "Lorena hopes to travel to South Korea one day!" is the infinitive form 'to travel'. In English grammar, after certain verbs like 'hopes', the infinitive form, which includes the base form of the verb with 'to' in front of it, is often used. This infinitive phrase functions nominally, serving as a direct object that indicates Lorena's aspiration or desire.