Final answer:
The appropriate preterite form of the verb 'hacer' to fill in the blank in the sentence 'Mis estudiantes ______ muy buenas preguntas' is 'hacen'.
Step-by-step explanation:
The sentence in question is: Mis estudiantes ______ muy buenas preguntas. The verb required to fill in the blank is 'hacen', which is the third-person plural preterite form of the verb 'hacer' (to do/make). It agrees with the subject 'Mis estudiantes' (My students).
Learn more about Spanish verb conjugation