Crossword

12345678
Across
  1. 2. to kill by preventing access of air
  2. 5. in a serious way
  3. 7. a furnace to burn waste
  4. 8. to cause to come to an inevitable bad end
Down
  1. 1. carried out without delay
  2. 3. not doubted
  3. 4. material used in the ground to support plant growth
  4. 6. material used to kill insect