5. Số thứ tự:
- first - eleventh - twenty-first
- second - twelfth - twenty-second
- third - thirteenth - twenty-third
- fourth - fourteenth - twenty-fourth
- fifth - fifteenth - twenty-fifth
- sixth - sixteen - ……………
- seventh - seventeenth - …………..
- eighth - eighteenth - …………..
- ninth - nineteenth - …………..
- tenth - twentieth - thirtieth
Nguồn: Internet
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