Spelling - ear making the er sound

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Across
  1. 2. Get money in turn for working 4 letters).
  2. 4. The planet on which we live (5 letters).
  3. 7. To really want something(5 letters).
  4. 8. We come to school to do this(5 letters).
Down
  1. 1. To look for something(6 letters).
  2. 3. Precious sphere found in an oyster (5 letters).
  3. 5. The opposite of late(5 letters).
  4. 6. The past tense version of the verb 'hear'(5 letters).