根据短文,完成句子
问题描述：
根据短文,完成句子
How is it?
The old man（老人） is already sixty years old.But he hasonly had fifteen birthdays.How is it?When is his birthday?
Keys:His birthday is on FEbruary 29th.It is a leap tear(闰年）every four years.So he has had only fifteen birthdays.
1.The only had( )years old.
2.He had only had( )birthdays
3.His birthday is on( )
4.A leap year happens(发生)every( )years
答
1.The only had(sixty )years old.
2.He had only had(fifteen )birthdays
3.His birthday is on(February 29th )
4.A leap year happens(发生)every(four )years