Dogsareoftenknown（46）"man'sbestfriends"．Themostattractivequalityofadogisitsfaithintheowneranditsloyalty．Theyalwaysgreetuswhenwecomehomeandtheywillneverleaveusinadesperatesituation．Forexampl

Question

Dogs are often known（46）___"man's best friends"．
The most attractive quality of a dog is its faith in the owner and its loyalty．They always greet us when we come home and they will never leave us in a desperate situation．For example，there was a very sick man and his dog barked and barked until the rescue team（47）___（arrive）．
Furthermore，dogs are strong animals（48）___will protect us．Houses with dogs are considered much safer．Not only will they stop the thieves，（49）___they will also fight against fire．For example，there was a serious fire and a dog tried（50）___（pull） its owner out．
And（51）___（final），dogs can be trained by people．Dogs can do a number of things that people can not．For example，they make contributions（52）___finding out drugs，bodies，illegal DVDs and hunt down prisoners with（53）___（they） noses．They're also used to help the elderly and disabled．
To sum up，dogs are really friendly，（54）___（practice）and loyal（55）___（animal）．

Answer 1

46．as．考查介词．固定短语be known as 表示"作为…被大家知道"，本句表示"大家都知道狗时人类最好的朋友．"
47．arrived．考查谓语动词．根据主句his dog barked and barked 是一般过去时态可知从句的谓语动词也用一般过去时态，所以用过去式arrived．
48．that/which．考查定语从句的关系词．代指先行词strong animals做定语从句的will protect us主语，用that/which．     
49．but．考查固定短语．Not only…but （also）表示"不但…而且"．
50．to pull．考查非谓语动词．try to do 表示"努力做某事"，本句表示"狗尽力吧主人拽出来"．       
51．finally．考查形容词和副词的用法．和上文的Furthermore呼应，用finally表示"最后"．
52．to．考查介词．固定短语  make contributions to表示"为…做贡献"．         
53．their．考查代词．代指狗们的，用their，表示"它们的鼻子"．
54．practical．考查派生词．和形容词friendly，loyal 并列用 practical，表示"实用的"．    
55．animals．考查名词．和主语dogs呼应用名词复数animals．