Answer:
Oh, sorry, dude. I wish I saw it sooner.
Explanation:
Blank 1 : ha sido
Blank 2: Han divertido
Blank 3: he recomendado
Blank4: has probado
Yo creo que el answer is c
Alli esta is grammatically correct. It is correct because alli esta means "there is" and in your example, There is the first floor, sounds better. The first floor is there doesn't sound correct to me. Hope this helps.