Mainak's crossword puzzle for the class

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Across
  1. 4. partially or fully hidden
  2. 5. positioning of a part
  3. 6. Created
  4. 7. Persistent
  5. 8. lengthened in time
Down
  1. 1. Something that causes trouble
  2. 2. a serious event of loss
  3. 3. is repeated