The sentences are each part of a story which follows a sequence of events. To complete this exercise, you must determine the order in which the events occurred. First, let's translate the sentences.
Abrí mi lista de canciones. - "I opened my songs list."
Escogí mi canción favorita y la añadí a mi nueva lista de canciones. - "I chose my favorite song and added it to my new list of songs."
Encendí mi mp3. - "I turned on my mp3."
Guardé mi nueva lista de canciones. - "I saved my new songs list."
Escuché mi canción favorita. - "I listened to my favorite song."
Hice una nueva lista de canciones. - "I made a new list of songs."
Now that everything is translated, you may be able to more easily ascertain the order of events.
Before listening to music, you must power on a device to do so, therefore it makes sense for the first step to be "I turned on my mp3".
Now the sequence may progress as follows.
"I opened my songs list."
"I listened to my favorite song."
"I made a new list of songs."
"I chose my favorite song and added it to my new list of songs."
"I saved my new songs list."
Answer:
1. primero: Encendí mi mp3.
2. segundo: Abrí mi lista de canciones.
3. tercero: Escuché mi canción favorita.
4. cuarto: Hice una nueva lista de canciones.
5. quinto: Escogí mi canción favorita y la añadí a mi nueva lista de canciones.
6. sexto: Guardé mi nueva lista de canciones.