What is this?
ruler
What is this?
rubber
What are these?
ruler and pencil
What are these?
book and pen
What is this?
book
What are these?
pen, pencil and ruler
What are these?
books
What are these?
pencils
What are these?
pens
What are these?
rubber
What is this?
pencil
What is this?
pen
What are these?
pencil and ruler