1. 

This is a big office.

2. 

The office is nice.

3. 

The phones are on the desk.

4. 

The phones are red.

5. 

The flowers are nice in the office.

6. 

The calendar's on the wall.

7. 

The wastebaskets are next to the desk.

8. 

The umbrella is on the wastebaskets.

9. 

The computer is good.

10. 

The chairs are black.