very easy crossword

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Across
  1. 4. land covered with grass or other low plants
  2. 5. a simple device for calculating
  3. 6. control or maintain the rate of speed
  4. 8. a sudden accident or catastrophe
  5. 9. enough/adequate
  6. 10. of or like a ghost in appearance
Down
  1. 1. not easily convinced
  2. 2. a series of contests
  3. 3. satisfy
  4. 7. without doubt