Fill in the missing words

4
What is this ?
What are these ?
These are
computers.
What are these ?
What is this ?
This is a chair
These are pens
This is a
board.
That is a teacher.
What are those ?
Those are schoolbags
What are those ?
Who is that ?
What is that ?
That is a pencil case.
Those are
books.
This / That exercise
1
2
3
8
5
6
7