Воткните неопределенный артикль, где необходимо. 1. This is book. It is

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