Hidy This looks like the right place for my inquiry @ESL books

I am a teacher at a small community college. They are having big cuts. Going to close for a three day weekend starting after christmas. Hopefully, they still want to offer the ESL conversation class. Thing is, as their teacher, I have the ultimate challege....teaching to a group of diverse language learners. (And I mean diverse..from multiple countries, varying levels of education-some very little to college grads).

Would you like to recommend a publisher or an ESL textbook that addresses this type of classroom? The students are all adult learners and it is a non-credit class-sort of a community service. Thank you for reading. o i should mention, this is my part-time evening job, i also work full time in elementary/secondary schools.
Tiddly