Adult class books recommendations.

Hey guys... What are your favorite books to recommend using in an adult Class.?
I've checked out all the books we have and I didn't find any one that I think might be suitable for my lower intermediate adult class.

Thanks in advance.

new english file and cutting edge are good. the teacher resource books are gold for conversation activities too

I like Cutting Edge and New English File too, but most recently I have been finding Empower to be a pretty solid book.