Los chicos ponen las manzanas en la nevera should fit into the sentence.
I hope this helps!
Cheers, July.
If you talk about the infinitive forms os the verbs:
I Spanish, the infinitive forms of the verbs have always an ending as -ar, -er, -ir called the first, second or third "conjugación".
First - verbs end in -ar, like: cantar, pasar, amar;
Second - verbs end in -er, like: leer, traer, correr;
Third - verbs end in -ir, like: morir, decir, vivir;
