用适当的数词完成下列句子
1.One h_______ years is a century.
2.Thursday is the f_______ day of the week.
3.Autumn is the t________ season of the year.
4.Christmas is on December the t_______ each year.
5.There are t_______ months in a year.________
6.My brother is just 20.Today is his _____(20岁) birthday.
7._______ （三分之二）of the fish have been sold out.__________