写出下列数字对应的基数词和序数词:

问题描述:

写出下列数字对应的基数词和序数词:
9_____..._____ 12_____..._____ 15_____..._____ 20_____..._____ 41_____..._____

nine ninth
twelve thelfth
fifteen fifteenth
tuenty twentieth
forty-one forty-first