Question

第一至第二十一/英语单词

Answer 1

one,two,three,four,five,six,seven,eight,nine,ten,eleven,

twelve,thirteen,fourteen,fifteen,sixteen,seventeen,eighteen,

nineteen,twenty,twenty-one

first,second,third,fourth,fifth,sixth,seventh,eighth,ninth,

tenth,eleventh,twelfth,thirteenth,fourteenth,fifteenth,sixteenth,seventeenth,eighteenth,

nineteenth,twentyth,twenty-first