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When did dogs become our best friends?
1. Despite our best attempts to work out when People first brought dogs to heel, it appears that man's best friend is still giving us the runaround.
    Although......., it appears that man's best friend is still giving us the runaround.

2 A few years ago, Peter Savolainen and his team at the Royal Institute of Technology in Stockholm started extensive research into the dog's domestication process.
  Peter Savolainen and his team at the Royal Institute of Technology in Stockholm ........ into the dog's domestication process for a few years now.

3. But Robert Wayne of the University of California at Los Angeles disagrees. He has used a similar technique to show that early human first took domestic dogs to the New World only a few thousand years later.
    But Robert Wayne of the University of California at Los Angeles,...., disagrees.

4. His findings imply that dogs were probably domesticated much earlier, about 40, 000 years ago.
    His findings imply that dog could.... about 40,000 years ago.

5. It is generally thought that dogs have evolved from Grey wolves living near ancient human settlements.
    Dogs are generally..... from Grey wolves living near ancient human settlements.

6. By analysing DNA sequences, Savolainen's team has shown up that modern dogs belong to five distinct genetic groups. The largest of these groups is most closely related to wolves found in East Asia.
    Savolainen's team has shown that modern dogs belong to five distinct genetic groups, .....is most closely related to wolves found un East Asia.