I have found, with teens especially, that references to pop culture help.
Most of them are fascinated with American and English popular music and a pop music stars and movies and movie stars.
Use song lyrics, movie trailers, current event items like Britney Spears. Weave these things into your lessons and let them know that once they learn English they will be able to understand the songs and movies that they like so well...
I hope this helps,
- For Teachers