A Small Something

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Across
  1. 3. Place "give" at A minus 3.
  2. 5. Place "reaction" at B minus 3.
  3. 7. Place "this" at C minus 3.
Down
  1. 1. Place "chemistry" at D plus 3.
  2. 2. Place "me" at E minus 19.
  3. 4. Place "is" at F divided by 4.
  4. 6. Place "joke" at G minus 11.