Race groups

12345678
Across
  1. 2. 5th clue
  2. 4. 6th clue
  3. 5. 8th clue
  4. 8. first clue
Down
  1. 1. 7th clue
  2. 3. fourth clue
  3. 6. second clue
  4. 7. third clue