Поставить нужно не глагол, а артикли.
1. He is AN American writer. 2. It’s A nice day. 3. He’s A happy man. 4. She’s AN old woman. My flat is _ cozy. 6. Some of THE
students. 7. My name is _ Steve. 8. We live in THE edge of THE town. 9. It’s A
very interesting film. 10. They have _ three children. 11. _Women are
often better teachers than _ men. 12. _ Summer is THE warmest season in THE/A
year. 13. There is AN old hotel in _ our town. 14. Our father is A dentist.
15. Walking IS A good exercise.