Well for starters indirect perception involves seeking additional information through passive perception, either confirm or refute your interpretations, AND direct perception checking involves asking straight out whether your interrelations of a perception are correct
Answer: Ramón tiene sed.
Explanation: Ramon is thirsty.
The correct word to fill the blank and complete the sentence is, leyendo.
¿Qué estás haciendo? Estoy leyendo un libro muy interesante.