The answer is huesped the first one
Te dejare elegir la pelicula pero, como esta cerrado aver si tu tienes un plan B para donde me vas a llevar.
I believe it is seria because una estudiante is feminine not masculine
The correct answer is dice.
•Por qué dice él gracias?
You are going to use the word dice to fill the blank because is the correct conjugation in the sentence.
On English the sentences should be:
Why does he says thank you?