Which are you studying (e.g., Elementary, Pre-Intermediate, Intermediate)?

: Useful for completing listening and comprehension tasks.

: For Beginner levels, you can find full episodes and transcripts on YouTube that cover the textbook's video units.

Which do you have (the color of the cover usually helps)? Headway Student's Site | Learning Resources

Since "GDZ" specifically refers to pre-solved answers, you are likely looking for the or Workbook with Key for your specific edition (e.g., 4th or 5th edition).

For the most accurate material, including interactive exercises and audio, use the Headway Student's Site. You can select your level (Beginner to Advanced) to find: