The 'ie' and 'ei' crossword

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Across
  1. 4. Use of free time for fun
  2. 6. From a different country
  3. 10. Naughty or troublesome
  4. 11. Winning / reaching a goal
  5. 13. To think something is true / to have an opinion
  6. 15. A number between one and ten
  7. 16. A person living next door to you
  8. 17. Someone who steals something
Down
  1. 1. Food group that includes meat and fish
  2. 2. The upper surface of a room
  3. 3. A section of something
  4. 5. A good amount of something
  5. 7. Used to describe something very old
  6. 8. A piece of paper showing you have bought something
  7. 9. Ruler of a country, usually a king or queen
  8. 12. A range of something
  9. 14. What you measure when you want to know how heavy something is