（写出相应的序数词及其缩写形式）one ____ ____two ____ ____three____ ____four ____ ____five____ ____eight____ ____nine____ ____twelve____ ____twenty____ ____thirty-one____ ____
答案
first,1st,second,2nd,third,3rd,fourth,4th,fifth,5th,eighth,8th,ninth,9th,twelfth,12th,twentieth,20th,thirty-first,31st
知识点：序数词
略
略
WORD格式（
