Only for intelligent people

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Across
  1. 4. what is this
  2. 7. what happened on September 3 in 1939
  3. 8. are you intelligent
Down
  1. 1. the thing that you write with
  2. 2. operation that evacuated children to the countryside
  3. 3. Man’s best friend
  4. 5. Flying mammal
  5. 6. what children are giving in August 1939