Adverbs of frequency

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Across
  1. 1. Happening at all times; 100% (6 letters)
  2. 3. Happening once a month (7 letters)
  3. 4. Happening once a day (5 letters)
  4. 6. Happening every hour (6 letters)
  5. 7. Happening almost never (6 letters)
  6. 9. Happening many times in a short period (9 letters)
  7. 10. Happening many times; common (5 letters)
Down
  1. 1. Happening once a year (8 letters)
  2. 2. Happening once every two weeks (11 letters)
  3. 5. Happening more than sometimes but not always (6 letters)
  4. 8. Another word for rarely (6 letters)