Final answer:
The verb 'trabaja' completes the sentence indicating location and means 'works'.
Step-by-step explanation:
The correct verb to complete the sentence is 'trabaja', which means 'works'.
'El Doctor Galeano trabaja en su oficina. ¡Trabaja mucho!'
This sentence indicates that Dr. Galeano works a lot in his office.
Learn more about Spanish verbs