Translation of "Spontaneously" in Italian

I received 15 responses spontaneously.

Ho ricevuto spontaneamente 15 risposte.

It occurred to me spontaneously.

Mi è venuto spontaneo.

It is the other to spontaneously offer.

È l'altro offre spontaneamente.

We both had the idea relatively spontaneously

Entrambi abbiamo avuto l'idea in modo relativamente spontaneo

Babies learn their native languages naturally and spontaneously

i bambini imparano la loro lingua madre in modo spontaneo

To be able to spend the evenings just to know spontaneously that

Per poter passare le serate, basta sapere spontaneamente: