Answer:
estás
Explanation:
From this point of view, Marco is asking a person directly, so he would use estas, instead of any other form of conjugation.
Secondly, eres is used to describe a permanent trait about a person; the way that Luisa is feeling, is only temporary, therefore you should not use Eres.
Yo propuesto would be correct
Todos son actividades físicas
im guessing you want this to be translated, so it translates to "
They arrive at the school at eight-fifteen" :)
