Final answer:
The word that best completes the sentence is "perezosos", which means lazy in English.
Step-by-step explanation:
The word that best completes the sentence "Los estudiantes no hicieron la tarea. Son muy ________" is "perezosos", which means lazy in English. This choice is the most appropriate because it reflects the fact that the students did not do their homework, implying laziness or lack of motivation.
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