twenty first class stamps 邮票上的.

twenty first class stamps 邮票上的. The first class in morning at twenty _______are the stamps?Twenty yuan The first class in the monring f_____ at twenty to nine first-class twenty-first简写 twenty-first怎么发音? twenty-first怎么读? first-class, second-class I collecting stamps.区这句话是我收集邮票的意思吗? twenty-first的简写可不可以是12th? the first class begins at的意思