Keep or change the 'y'

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Across
  1. 3. A feeling of happiness or fun.
  2. 5. Very nice to look at.
  3. 6. When something is late or slowed down.
  4. 8. Being used or taken.
Down
  1. 1. Remained in one place.
  2. 2. Looked at or learned something carefully.
  3. 4. Can be trusted.
  4. 5. Put under the ground.
  5. 7. The least difficult.