Question

Is this/these your exercise book?
No,it isn't.That is/These are my exercise book.It is green.
This is/These are my pens,that is/those are her pens.
This/These aren't your pencils.They are my pencils.
Are this /these your CDs?
No.Those/That are my CDs in that/those bag.

Answer 1

1)thise.
2)that is
3)these are,those are
4)this
5)this
6)those

Answer 2

1. Is this. 2. That is. 3.These are. Those are. 4.This. 5.Are this. 6.Those. That.