1. Alex [?] a student. 2. Linda [?] a doctor. 3. It [2] dog. 4. I a pupil. 5. They [?] friends. 6. Mand Dennis [2] brothers. 7. He [2] a pilot. 8. It [2] a black pen. 9. You [2] a little boy. 10. Liza and Laura [2] sisters.