consonant alternation

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Across
  1. 1. what you need to provide when lifting heavy objects
  2. 3. what a mouse will come to look for
  3. 7. used in world war 2
  4. 8. An important part at the end of a letter
Down
  1. 2. to fall apart
  2. 4. to be attacked continously
  3. 5. Sometimes you have to STOP
  4. 6. what you become after lifting heavy objects