Cuando usas "e" en vez de "y"? cuando usar "u" en vez de "o"?

The answer to the question: ¿cuándo usas "e" en vez de "y"? ¿cuándo usar "u" en vez de "o"? is:

Explanation:

In Spanish there are two very particular cases called:

1. Change of the word "y": which occurs when the conjunction "y" is transformed into "e", this occurs when:

Example:

- Solo debes saber leer, tiempo e imaginación.

2. Change of the word "o": Occurs when the conjunction "o" becomes "u", this occurs because:

Example:

- Prefieres dirigir u organizar.

i got it here  

fill in the blank with the correct answer. carlos and sofia and from toa baja to travel west along the coast.