Hello! My first time teaching, and teaching in Kosovo. Looking for the best textbook for conversational and/or business English for small classes (5 - 12 people) at the intermediate and advanced stages of learning. (Preferably American English, as I'm from the U.S., but I'll run with whatever is best.)
Appreciate any and all help and notes about why a specific textbook / curriculum works well for you. So far I've seen recommendations for Interchange: Beginners to Intermediate from Cambridge, but also need an advanced textbook.