Crossword 'ough' Words

12345678
Across
  1. 4. the base of a pizza, and makes bread
  2. 6. sounds like through without the letter 'r'
  3. 7. to do something carefully and completely
  4. 8. another name for the branch of a tree
Down
  1. 1. sounds like thorough but with a letter 'b'
  2. 2. a sudden important scientific discovery
  3. 3. used by farmers in fields, turns up soil
  4. 5. you walk _ _ _ _ _ _ _ a door