It is my mother's birthday.I buy a card.Why ____I buy a card?横线上是不是填do?

whose is it?---it's my mother's. My mother's s.is my sister. My mother's ring is My mother's or father's mother is my She is my mother s mother.she is my (She is my mother s mother.she is my ( ). My mother's brother is my _. My sister is my mother's( ) My father 's mother is my g____ isn't,is,your,my,aunt,mother,no,that,it,it's.连词组句 May 5th is a s______ day because it‘s my mother's birthday The ring is on the table.It's my mother's同意替换 my mother today is my mother’s birthday啥意思? Today is my mother's ____ birthday. My mother's favourte fruit is apple My mother's birthday is in September. How is my mother's ring It is not my sister,nor my brother.but it's still the child of my father and mother.who is it? My mother's mother is 81 years old对My mother's提问 急.现在就要