MONO words

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Across
  1. 2. words such as car, desk, pool, stop, and box
  2. 4. when a company controls all of the service or product
  3. 6. gentlemen of the past often used this to see things better
  4. 7. a painting with all shades of blue
  5. 8. the prefix meaning one
  6. 9. transportation that has only one rail
Down
  1. 1. only speaking one language
  2. 3. someone who has this would rather always be in a group
  3. 5. a speech given by one person, such as a talk show host
  4. 7. a formation made of one rock, such as Mt. Rushmore
  5. 8. use expression in your voice so you don't sound this