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Dogs have been () friends for thousands of years. Many stories are told about how brave dogs were in helping the people in ().With the help of dogs, many people()in the snow were able to go home. dogs () in the research work in many fields of science too. The first world's space traveler was a dog ()Laika.
Dogs () film stars too.A dog called Lassie was the star in quite a few American films.
Dogs can hear and smell() than man,but they cannot see well.A dog may live()about 12 or 13 years.A thirteen-year-old child is not grown up () ,but a thirteen-year-old dog is a very () dog indeed.
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