Voices fill airwaves.
Meaning: This means that the sounds of people talking can be heard over the radio.
Choice of Words: Voices are sounds that people make when they talk. Fill means to occupy or to take up space. Airwaves are the radio waves that carry sounds through the air. So, 'Voices fill airwaves' means that the sounds of people talking can occupy or take up space on the radio waves that travel through the air.
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