Where is the book?
The book is under the table.
Where is the pencil?
The pencil is in the pencil case.
The ruler is ... the bag.
in
The computer is ... the desk.
on
Where is the cat?
The cat is on the chair.
The teddy bear is ... the table.
under
Where is the dog?
The dog is on the cat.
Where is the cat?
The cat is in the box.