写出基数词2l∼30的序数词

1:one— first
2:two— second
3:three— third
4:four-fourth
5:five— fifth
6:six— sixth
7:seven— seventh
8:eight— eighth
9:nine— ninth
10:ten— tenth
11:eleven— eleventh
12:twelve— twelfth
13:thirteen— thirteenth
14:fourteen— fourteenth
15:fifteen— fifteenth
16:sixteen— sixteenth
17:seventeen— seventeenth
18:eighteen— eighteenth
19:nineteen— nineteenth
20:twenty— twentieth
21:twenty-one— twentieth-first
22:twenty-two— twentieth-second
23:twenty-three— twentieth-third
24:twenty-fuor— twentieth-fourth
25:twenty-five— twentieth-fifth
26:twenty-six— twentieth-sixth
27:twenty-seven— twentieth-seventh
28:twenty-eight— twentieth-eighth
29:twenty-nine—twentieth-ninth
30:thirty—thirtieth