Help with 9&10 please

Fill the blank with a la, a los, a las, or al. los alumnos .

"in english, write six to eight sentences comparing cultural aspects of greetings in spanish-speaking countries with greetings in your own culture. use what you learned in the lessons to tell about three differences and three similarities. discuss non-verbal greetings and how respect is shown. you may also include verbal greetings, but do not simply translate phrases from one language to another."

Son cristianos pero no creen en la autoridad del papa ni en la intercesión de la virgen maría.