. ISBN - 13 978-0-S21-80S78-0 Student's Book ISB N-lO 0- S21-80S78-3 Student's Book ISBN-13 978-0-S21-80S79-7 Teacher's Book ISBN-10 0-521-80579-1 Teacher 's Book ISBN-13. ISBN -lO 0-521-80580-5 Workbook ISBN- 13 978-0-521-01017-7 Workbook with Answers IS BN -10 0 -5 21- 01017-9 Workbook w ith Answers ISBN - 13 978-0-521-80581-0 Class Cassette Set ISBN- 10. Wendy Sharp for permission to reproduce their origi nal course book concept in Objective PET and in all other Objective examination course books. The au th ors would like to thank Sue