Solid, liquid, gas ^^
For example, if you have an ice cube you have a solid piece of matter, but if you heat it up it melts and then it's liquid, and after getting hot enough it evaporates and even though you can't see it it's still there, but as a gas.
By the way, what's this have to do with Spanish?
Answer:
Hoy la Sr.Juan va a hablar _de___ lo que hacemos en nuestro __estudio___ grande para el examen final.
Holaaaa yo también hahah estoy en escuelaaa