The relationship between human and dog dates back to at least 8,000 years ago. Different types of dogs were __1__ for different tasks: the ancient people in west Asia, for example, trained greyhounds(灰狗） to __2__ wild asses; in medieval manuscripts, illustrations of hunting scenes show terriers（猎犬） __3__ rabbits.Recent research shows that dogs __4__ another useful functions: they keep us healthy. People who have any sort of pet are more likely to __5__ heart attacks （blood pressure rises when we talk to one another whereas it drops when we pat a pet). Dog owners in particular show considerably __6__ self-esteem and a 50% reduction in minor health problems only ten months after acquiring their pet.In the UK, thousands of people visit the annual dog show,”Crufts”, held in London. This show receives wide national and international media __7__. Fierce discussion rage when dog liberty is threatened. There is no dog licence in the UK because it was __8__ several years ago. A recent law, the Dangerous Dogs Act, requires owners of especially vicious dogs, such as Pit Bull Terriers, to __9__ their dogs with the authorities and muzzle(戴口罩）them when taking them outside. There was a great __10__ from the public when this law was introduced.A.abolished B. developed C. facilitated D. registerE.reporting F.protest G.coverage H.approvedI.improved J.perform K.achieve L.pursuingM.abandoned N.survive O.chase