His mother is ______. Today is his mother’s thirtieth birthday.

A. thirteenB. thirty C. Thirtieth

Today is her ________birthday.

1. A.
   thirdth
2. B.
   fifteen
3. C.
   twentith
4. D.
   thirtieth

The hero of the story is an artist in his          .

       A．thirtieth               B．thirty                   C．thirty’s                D．thirties

His mother is ______. Today is his mother’s thirtiethbirthday.
A. thirteen         B. thirty          C. Thirtieth