Final answer:
The correct vocabulary words to complete the sentences are 'complicados' and 'exigentes' in Spanish.
Step-by-step explanation:
The correct vocabulary words that best complete the sentences are 'complicados' and 'exigentes'.
For example, if the sentence is 'Mis clases tienen muchas tareas, son muy ______', the word 'complicados' would fit in the blank. This means that the classes have a lot of tasks and they are complicated.
Similarly, if the sentence is 'Mis clases tienen muchas tareas, son muy ______', the word 'exigentes' would be the correct choice. This means that the classes have a lot of tasks and they are demanding.
Learn more about Completing sentences in Spanish