1.Susie and Mark aren't eating biscuits. They are eating delicious cakes.
2.Mark isn't reading a book. He is reading a computer magazine.
3.Susie and Mark aren't sitting in a restaurant. They are sitting in a cafe.
4.Mark isn't looking at an advert for new bike. He is looking at an advert computer game.
5.Susie's friend isn't shopping with her dad. Her friend is shopping with her mum.