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用序數(shù)詞填寫下面的表格。
one 1.______       eleven 11.______                 
two 2.______        twelve 12.______       
three 3.______        thirteen 13.______       
four 4.______        fourteen 14.______       
five 5.______        fifteen 15.______       
six 6.______        sixteen 16.______       
seven 7.______        seventeen 17.______       
eight 8.______        eighteen 18.______       
nine 9.______        nineteen 19.______       
ten 10.______        twenty 20.______       
1. first 2. second 3. third 4. fourth 5. fifth
6. sixth 7. seventh 8. eighth 9. ninth 10. tenth
11. eleventh 12. twelfth 13. thirteenth 14. fourteenth 15. fifteenth
16. sixteenth 17. seventeenth 18. eighteenth 19. nineteenth 20. twentieth
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