如果……不胜感激

　　务必……

　　count on it that 相信……

　　一谈到……；就……而论

　　语法填空

　　__1__ cities in the west，you often see a lot of people walking with dogs.__2__ is still true that the dog is the most useful and faithful animal in the world.But the reasons why people keep __3__ dog have changed.In the old days，people used to train dogs to protect __4__ against the attacks by other beasts.And later they came to realize that the dog was not only useful but willing to obey __5__ master.For example，when people used dogs for __6__(hunt)，the dogs would not eat what they caught without permission.But now people in the city need not protect themselves against attacks of animals.Why do they keep dogs，then？Some people keep dogs __7__(protect)themselves from robbery__8__ most important reason is for companionship.For a child，a dog is his best friend when he has no friends to play __9__；for young couples__10__(mainly)reason why people keep dogs has changed from protection to friendship.

　　1．the　此处特指西部城市前用定冠词。

　　It　此处代替that引导的从句作主语用it。

　　a　泛指“一条狗”前用不定冠词。

　　themselves　protect的宾语与主语互指所以填反身代词themselves后文也有呼应。

　　its　此处表示“狗的主人”所以masterits。

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