Humansandanimalshavealwayslivedtogether．Forexample，manypeoplehavedogsin（61）___homes．Dogs（62）___（be）veryaffectionateanimals．Theyarealsoverysensitivetothefeelingsofthepeoplewith（63）___theylive，and

　　Humans and animals have always lived together．For example，many people have dogs in （61）___ homes．Dogs （62）___ （be）very affectionate animals．They are also very sensitive to the feelings of the people with（63）___ they live，and it seems quite natural （64）___ （have） them in our houses．（65）___ all the many different types of dogs come from one species of animal，the grey wolf．These wild animals came into villages 12，000years ago，（66）___ （look） for food．People found that wolves could help in the （67）___ （day） struggle for survival by guarding their homes and （68）___ （hunt） wildlife to kill and eat．In some very cold parts of Northern Canada，the skin of very old dogs is still used （69）___ warm clothes．Dogs are useful and many people love them-that is why they （70）___ （call）"man's best friend"．