Вставьте 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.