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--- 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．/; nineth

D．which; ninth

-Do you know the boy       is sitting next to Peter?
-Yes,He is Peter’s friend,They are celebrating his        birthday.

A．/;nineth

B．that, nineth

C．who,ninth

D．who,the ninth

-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．/; nineth

D．which; ninth