Verified audio acts as a . Just as a guitarist tunes to a verified 440Hz A note, you tune your English ear to the verified voice of Lesson 21.
This lesson tells the story of an aerodrome built near a village, which residents find incredibly loud. One resident, however, is amused by it because the planes are so close they almost touch the chimneys. Audio Length: Verified recordings for this lesson typically run around 1 minute and 16 seconds Book 1: First Things First Lesson Title: "Which book?" Audio Length: new concept english practice and progress audio 21 verified