9. Choose the necessary pronoun.
1. (He, his) is an engineer.
2. (She, her) daughter is thirteen.
3. (They, their) friends are economists.
4. How old is (she, her)?
5. (They, their) are not students.
6. Is (she, her) in that room now?
7. Is (he, his) an economist or an engineer?
8. Are (they, their children pupils or students?
9. Is (he, his) day off Sunday or Monday?
10. (You, your) sister is nice.
11. Don't tell (I, my) brother about it.
12. Are (they, their) at the office or at home now?