The old man didn't look up. "We sell books here, son. Not cheat sheets."
The answer key is available through several official and educational platforms: Official Pearson Resources Expert IELTS Teacher's Resource Book expert ielts 5 answer key pdf
A: Even official keys have typos. Cross-check with a second source (e.g., a grammar guide or a teacher). If you confirm an error, report it to Pearson via their customer support. The old man didn't look up