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16 June, 17:14

Billy tapped the ruler and it made a funny noise. Billy heard the sound because the ruler vibrated

forth.

molecules back and

the air

his ear

the table

his finger

+1
Answers (2)
  1. 16 June, 17:24
    0
    Answer: the air
  2. 16 June, 17:31
    0
    table I think ...
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