unit 1,2

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Across
  1. 1. something that blocks
  2. 3. to remove impurities and poisens
  3. 5. a person who leaves school
  4. 8. physical harm or damage
  5. 9. totally remove something
  6. 10. a principle or standart by which something may be judged or decided
Down
  1. 2. to agree with and give encouragement to someone
  2. 3. to become worse
  3. 4. a pattern ,plan
  4. 6. the topic of discussion or writing
  5. 7. to prevent