Question

When you take a walk in any of the cities in the West, you often see a lot of people1. (walk) with dogs. It is still true that the dog is the most useful and faithful animal in the world. But the reasons why people keep a dog2.(change). In the old days, people used to train dogs to protect themselves against the attacks from3.beasts. And later they came4.( realize) that the dog was not only useful5.willing to obey its master. For example, when people used dogs for hunting, the dogs would not eat what they caught without6.(permit). But now people in the city need not protect themselves against attacks of animals. Why do they keep dogs, then? Some people keep dogs to protect themselves from robbery, but the 7.(important) reason is for companionship. For a child,8.dog is his best friend when he has no friends to play with; for a young couple, a dog is 9.child when they have no children; for old couples, a dog is also their child when their real children have grown up. So the main reason why people keep dogs has changed10.protection to friendship.

Answer

1.walking

2.have changed

3.other

4.to realize

5.but (also)

6.permission

7.most important

8.a

9.their

10.from

【解析】人们养狗的原因从过去到现在发生了改变。

1.考查非谓语动词。此处为see sb doing：看见某人正在做某事。从非谓语的角度来理解也可，此句已有谓语，故填非谓语，逻辑主语people和walk之间是主动关系，故用walking。

2.考查时态。后文中讲到过去人们养狗的原因，而前面说的是现在，故此处用现在完成时，动作发生在过去，一直到现在，包含两个时间。且句子的主语是复数，故填have changed。

3.考查代词。此处意思：人们养狗是为了保护他们自己免受其它野兽的袭击，根据意思可填other。

4.考查动词不定式。此处为固定短语：come to do：逐渐做某事。此处意为逐渐意识到。

5.考查固定句型。此处为固定句型：not only……but（also）：不但……而且。

6.考查名词。Without是介词，后接名词，此处意为没经过允许，故填permission。

7.考查形容词最高级。此处意为：但是最重要的原因是陪伴，前面有定冠词the做提示，故填most important。

8.考查冠词。Dog是可数名词，可数名词出现在句中要么用单数，要么用复数，此处后文his best friend是单数，所以dog用单数概念，加a。

9.考查代词。此处意为：对一对年轻的夫妇而言，狗是他们的孩子。Couple是复数，第三人称，故用their指代。

10.考查介词。此处意思是说从保护变成了其它的，用change from。