Final answer:
The word that best completes the sentence is 'perezosos', meaning lazy in English.
Step-by-step explanation:
Los estudiantes no hicieron la tarea. Son muy perezosos.
The student is asked to choose the Spanish word that best completes the sentence 'Los estudiantes no hicieron la tarea. Son muy _____.' The correct word to choose here is 'perezosos,' which means lazy in English. This word best fits the context of the sentence and describes the students who did not do their homework.
Learn more about Word completion in Spanish