Here are the completed sentences:

1. **There is** an armchair in the living room.
2. **Are there** any mountains behind your house?
3. **There is** a well next to the house.
4. **There are** trees and flowers in the yard.
5. **Are there** any vegetables in the garden?
6. **Is there** a clock on the wall?
7. **Is there** a lamp on the desk?
8. **There are** five girls in the bookstore.
9. **Is there** a fridge in the kitchen?
10. **There is** a sofa in the living room.