A farmer had some little dogs to sell.As he was putting up a

A farmer had some little dogs to sell.As he was putting up an advertisement on the fence of his yard,a __31__ happened to pass by.
“I want to __32__ one of your dogs,sir .”
“Well,”said the farmer,“these dogs come from fine parents and cost a lot of __33__.”
The boy __34__ his head for a moment.Then he reached deep into his __35__ and pulled out some change.“I’ve got thirty-nine cents(美分).Is that __36__ to take a look?”
“­­__37__,”said the farmer.And with that he let out a whistle(口哨),“Here,Dolly!”
Dolly ran out of the doghouse ___38___ by four little dogs.The boy’s eyes danced with joy.
As the dogs made their way to the fence,the little boy noticed something else moving inside the __39__.Slowly another little dog __40__; this one much smaller.It was doing its best to __41__...
“I want that one,”the little boy said.
The farmer said,“Son,don’t want that dog.He will __42__ be able to run and play with you like the other dogs would.”
The boy rolled up(卷起) one leg of his pants and showed a steel(钢) __43__.Looking back up at the farmer,he said,“You see,sir ,I don’t __44__ too well myself ,and he will need someone who __45__.”
(38 )
A.sent B.driven C.followed D.taught
实在想不通答案都选A.请诸位帮助解疑.
(41) A.catch up B.go away C.give up D.look out
A为何不可,而选D
44.A.speak B.run C.walk D.swim
B为什么不行而选C

看了题目感觉这是一篇中学的阅读理解题目吧,应该不会有很超范围的词汇理解出现.说说我的看法：
1）38空,选C是可以接受的,因为我不知道be sent by 除了有被发送外的其他字面意义,选第三项可以翻译成,Dolly后面跟着四条小狗儿,从上下文来看是通顺合理的.
2) 41空,四个选项排除语意不符的B、C干扰,AD是您要区分的地方,如果选了A,那么翻译这句话就是“小狗在尽力的追赶跟上（其他四条小狗）”,但是还要注意下文42空的地方“ He will __42__ be able to run and play with you like the other dogs would.”这里说这条小狗是不能够跑的,所以41空要填look out才对.
44）这个需要对全文的把握,提到小狗尽力向外看不能跑,年轻人自己也是腿有残疾,不方便行走,不必用到run这个程度来说明
希望我的理解对你有所帮助,如果还有不明白的话,咱们继续交流