In the audio disc for level 4 rellenar (I think this was the word) was used in one session; in the the next session llenar was used. Llenar is used in the Level 4, Session 8. Which is best for what situations?
In the audio disc for level 4, #6, apartar (I think this is the word) is used at the beginning of the session but estacionar was used in a latter part of the same session. Which is best for what situations?