The New Headway English Course Workbooks, designed by Liz and John Soars and published by Oxford University Press, offer comprehensive, skill-focused practice exercises that complement the main student books. These copyrighted, multi-level educational materials are widely used for developing grammar and vocabulary in adult learners.
You can purchase physical copies on Amazon or find various editions and answer keys on the Headway Teacher's Site . New Headway Plus Intermediate Workbook with Key New Headway English Course: Workbook (With Key)...