请写出下列数字的序数词形式. 1. 15 3. 8 5. 21 7. 2 9. 1 2. 9 4. 12 6. 5 8. 3 10. 42

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请写出下列数字的序数词形式。

1. 15_________________
3. 8_________________
5. 21_________________
7. 2_________________
9. 1_________________

2. 9_________________
4. 12_________________
6. 5_________________
8. 3_________________
10. 42 _________________

1. fifteenth 2. ninth 3. eighth 4. twelfth 5. twenty-first 6. fifth 7. second 8. third 9. first 10. forty-second