поставьте нудный артикль, если нет определителя перед существительным

1, her ...sister is at ...university now
2. This ...baby is sleeping in ...bed
3. We live in ...big flat on ...seventh floor
4. His ...college is in ...center of the city
5. There is....bird in ...tree
6. We have ...museum in this ...street
7. There are some....cherries on....plate