It all sounds good but you have to tweak a few sentences. For example in the second sentence and third sentence divide it into two because it sounds like a run on sentence. Instead write "He conocido a Miguel durante dos años. El es muy trabajador y distfruta haciendo música. Ha trabajado en IHOP desde hace casi tres años. A el le encanta ver las sonrisas en la cara de la gente cuando cocina para ellos."
B. Libre
En mi tiempo libre me gusta tocar la guitarra, leer, y escribir poemas.
In my free time, I like to play guitar, read, and write poems.
If you have to complete with a correct verb, this sentence should be complete in the following way;
"el horno ESTÁ en la cocina". This would mean that the oven IS in the kitchen.
the verb "está" derives from "estar." it is use in present tense and simple form because the noun is in singular. In this case, it would make reference to the place in which the oven is, the place in the house.