Listening rocks - technology

Listening rocks  - technology
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คำแนะนำของผู้เขียน

FIRST, READ THE TEXT AND TRY TO GUESS THE MISSING WORDS. CHECK. DO IT AGAIN ANOTHER TIME
BY LISTENING TO THE AUDIO CLIP.
THEN, FILL IN THE GAPS AND CHECK AGAIN

CHECK: cutting edge: the latest or most advanced stage in the development of something.