5. Số thứ tự

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