1. (2020六下·密山期末) 选词填空。请从方框中选出正确的答案，并将正确的单词填入下面题号的横线上。

When          about            old            birthday           on

A: Now, Alice, howare you?

B: I'm 13.

A: is your birthday?

B: It's  September 5th.

A: And how Frank?

B: Frank isn't here today, but his is on July 4th.

A: Thank you, Alice.