....? Letizia went to an Ecuadorians restaurant?
En el cajon no hay Ninguna toalla limpia.
That could work
La respuesta es: las palabras se las lleva el viento.
For most adjectives, the endings are like this:
o : masculine singular
os : masculine plural
a : feminine singular
as : feminine plural
La abuela means the grandmother. It is a feminine singular word. Therefore, you use the ending -a, so the answer is vieja.
Also, keep in mind that the adjective endings match noun endings. Abuela has the ending -a, so the adjective should also end in -a.
The answer for this is "Estoy en casa." :)