Below is a text with blanks. Click on each blank, a list of choices will appear. Select the appropriate answer choice for each blank.
下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
Dogs, the first animals, evolved from East Asian wolves approximately 20,000-40,000 years ago. Dogs understand human body languages, many spoken words, and even abstract symbols. Dogs pay attention to human faces and eyes, and they often to humans to help solve problems. Dogs and humans form a emotional bond that reduces stress in both species. Being dogs improve human physical and mental awell-being. Most dogs are very social and play with other dogs if they can. Stray and feral dogs are common on the edges of human society. They form social groups, and sometimes cooperate in territorial defense, much as wolves do.
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