Irregular Past Simple Tense

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Across
  1. 1. Past simple of 'Buy'
  2. 3. Past simple of 'Eat'
  3. 5. Past simple of 'Sing'
  4. 6. Past simple of 'Have'
Down
  1. 2. Past simple of 'Teach'
  2. 4. Past simple of 'Be'
  3. 7. Past simple of 'Drink'