Mono

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Across
  1. 3. speech by one person
  2. 5. one syllable
  3. 7. one single large block or piece of stone
Down
  1. 1. eyeglass for one eye
  2. 2. one tone of voice
  3. 3. speaking one language
  4. 4. one there or by your self
  5. 5. one color
  6. 6. one rail
  7. 7. one company