Final answer:
The best verb to complete the sentence 'Papá prefiere que yo...' is 'salga'. It is used to express Papá's preference for the student to leave on time and not arrive late to work.
Step-by-step explanation:
The best verb to complete the sentence 'Papá prefiere que yo...' is salga. The verb 'salga' is in the subjunctive form and is used to express a preference or desire. It is appropriate to use in this context because Papá prefers that the student leaves on time and doesn't arrive late to work.
Learn more about Spanish verbs