Games

Interchange Arcade

http://www.cambridge.org/interchangearcade/

Passages Vocabulary Practice

http://www.memrise.com/course/262381/passages-1-3rd-edition-official/

http://www.memrise.com/course/262388/passages-2-3rd-edition-official/

Resources

Interchange Class Audio

http://www.cambridge.org/interchange/audioprogram/?utm_source

Passages Class Audio

http://www.cambridge.org/us/esl/passages3/audio/

The Free Dictionary

http://www.thefreedictionary.com/