5.

1)Where are you keys? There are in my bag.

2)Where is Boris? He is in the planetarium.

3)Where are the curtains? There're in the bedroom.

4)Where are the towels? They're in the bathroom.

5)Where is the bookcase? It's in the study(здесь я не уверена).

6)Where is my pyjamas? It's on the chair.

7)Where is the mirror? It's in the hall.

8)Where is the armchair? It's in the kitchen.

9)Where are my clothes? They're in the wardrobe.

10)Where is the carpet? It's in the living room.