ISBN: 0-13-140884-4 There is Longman PBT audio 7 CDs in mp3 form.. I don't think that it is so usefull, but someone may need it Code: http://rapidshare.com/files/114812843/pbt.part1.rar http://rapidshare.com/files/114819073/pbt.part2.rar http://rapidshare.com/files/114827080/pbt.part3...