1——Do you know the boy( )is sitting next to Peter?

1——Do you know the boy( )is sitting next to Peter?
-----Yes,He is Peter's friend.They are celebrating his ( )birthday.
A who ninth B that nineth C / ninth Dwhich ninth
2-----Sally is ( ) one in two class.
-----She got ( ) present from her presents.
A the first,ninth B first,the ninth C at first ,ninth D the first,the ninth