根据短文内容和首字母提示填空 Dogs are friends of man.They w___ for us.They
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Dogs are friends of man.They work for us.They hunt for us.They play with us.But once,all over the world,dogs were wild.Thousands of years ago,man began to train the wild dogs .The strong dogs became working alone.They were trained to protect the heavy loads.Theylearnt to keep watching sheep and other animals.Wild dogs had other jobs,too Some dogs were not strong.But they could help man hunt for_games.Other dogs were the best animal pets.At first,there were over a few kinds of dogs.Today,there are more than 100kinds
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