1. — Is December-ninth your ______?
    — No, it's Mary's.
2. Alice is twelve years old. ______ is her birthday?
3. — ______ Jim's birthday November fifth?
    — Yes, it is.
4. — How ______ is your sister?
    — She's ten years old.
5. — ______ you thirteen years old?
    — Yes, I am.