La palabra caer es hiato o diptongo? HELP PLEASE

It’s almost lunchtime and an exchange student from paraguay is asking for directions to the cafeteria. give them directions (using the phrases you learned in the tutorial) from your spanish class to the cafeteria. make sure that you include at least 4 commands that you learned in this unit, and if you need to, be creative with the route they will take (we won’t call your principal to verify). remember, the main goal is to practice directions vocabulary!

Fue justo que la empresa la tierra a los indígenas. a. devolver b. devolviera c. devolviéramos d. devolvieran

Choose the phrase that uses se in the passive voice. a. se lo va a dar al ingeniero. b. se venden chocolates en la tienda. c. yo sé la respuesta. d. el chico se va el viernes.