you don't give specific area you want to improve, but your words sound like you might want to improve written or some type of formal communications. I think tho

you don't give specific area you want to improve, but your words sound like you might want to improve written or some type of formal communications. I think those recordings at Oyez might be an interest choice. Listen the recordings while read the transcript on screen. It is a mix of both formally written and quick verbal exchanges. And some of the recordings are really interesting and informative. If you prefer reading, I suggest ALDaily, hand-chosen light reads everyday, covers many fields of literacy, and well-writen.