Nosotros nos cuando oímos el despertador.

In English, this translates to:

We when we heard the alarm.

You can fill in the blank with:

- Woke up
(We woke up when we heard the alarm.)

In Spanish that would be:

- Levantamos
(Nosotros nos levantamos cuando oímos el despertador.)

You can fill in the blank with:

- Left
(We left when we heard the alarm.)

In Spanish that would be:

- Fuimos
(Nosotros nos fuimos cuando oímos el despertador.)

Those are just some examples. Hope that helps.