My little crossword

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Across
  1. 2. when your truthful
  2. 5. what does a chemist use?
  3. 7. something happening twice
  4. 8. it is like the pharmacist
Down
  1. 1. it could be when you see a place or a part of a
  2. 3. a subject when you experiment
  3. 4. sound repeating it self in an empty
  4. 6. when there is a problem