a)In the next three years several demonstration houses will be finished and equipped with a robot and the domestic systems of a 'smart home.' (b)This idea happens because nowadays nobody take care old-aged people and leave them stay alone in the house. (c1)One factor of this problem is because new generations have to find money to survive in the world of money. (c2) In addition, some of them would like to live alone in their home as they think that they can take care themselves; however, with no caregiver, it might not be safe.