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.
La idea que le dio su primo fue que se fuera a vivir con la novia, que si la ama luche por ella
