li is the boy is --- birthday today he is five years old nowa\ fifteenb\fifthc\ five说理由!

li is the boy is --- birthday today he is five years old nowa\ fifteenb\fifthc\ five说理由!
li is the boy is --- birthday today he is five years old now
a\ fifteen
b\fifth
c\ five
说理由!

li is the boy is --- birthday today he is five years old nowa\ fifteenb\fifthc\ five说理由!
选 B fifth
今天是这个男孩的第五个生日.他现在五岁了.