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Sticky Note
A computer works ___ electrical signals
  1. in
  2. on
  3. by
  4. over
Explanation

A computer works by electrical signals.


"By" is used to indicate the means or method by which the action is performed

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She is good ____ cooling?
  1. At
  2. With
  3. On
  4. None of these
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Since she believed _____ her abilities, she didn't ask _____ any help.
  1. An, For
  2. At, For
  3. In, For
  4. None of these
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  1. At
  2. On
  3. In
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  1. In
  2. On
  3. Over
  4. None of these
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  1. On
  2. In
  3. At
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