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More and more families like to k＿＿ dogs as pets. But not all dog owners think of others while they are walking their dogs. So many towns and cities around the world f    a mess of left-behind feces(粪便)from dogs.
In February of this year, a town in France started a new p      to teach dog owners a lesson. The g      sent about 20 volunteers to search the streets carefully, looking for humans who wouldn't clean up after their dogs. The volunteers who seemed to have no clear aim would then move nearer to the pet owner, then start a conversation in order to get the dog's name. "W    the name of the dog and its type, we can e      discover the owner from the registered(登记) database(信息库)held in the town hall." an officer e     . The volunteers would then pick up the dog feces and the package would be p     to the pet owner's house. In the past few m        , the town has seen a 70% decrease减少)in the amount of dog feces left on public streets.
Maybe many cities in our country can follow its e    . In this way there will be fewer complaints about dog owners.