Descripción o resumen: Four Corners is an integrated four-skills English course for adults and young adults. Four Corners Level 4 Students Book with Self-study CD-ROM and Online Workbook Pack provides additional activities to reinforce what is presented in the Students Book. The Online Workbook includes activities which correspond to the Students Book lessons; instant feedback for hundreds of activities; clear, easy-to-follow navigation to support self-study; and simple tools to monitor progress. The CD-ROM contains supplementary exercises. The corresponding Audio CDs are only sold separately.