Вставьте неопределенный артикль, где необходимо. 1. This is… book. It is my … book. 2. I have … sister. My …sister is

1. This is a book. It is my book. 2. I have a sister. My sister is a doctor. 3. They have a dog and two cats. 4. There is a little brown coffee table in our room. 5. My sister is at work. 6. There are beautiful trees in our park. 7. What a nice day today! 8. It is such a difficult task. 9. My mother keeps a house. 10. We usually have lunch at 12.