Bobby was a dog that went every moming to a baker's shop to fetch twelve bread roll for its owner. However. when Bobby returned back one day, it had only eleven rolls. Bobby's owner wants to know what had happened, but he followed Bobby to the baker's shop the next day Instead taking the road home as usually. Bobby took another road and went up to a farm. There was a poorer little dog with a broken leg. Bobby was offered the roll to the little dog. The owner was very proud of Bobby and rewarded itself a nice big bone. Later, the owner's family never grew tired of tell everybody how kind and clever Bobby wasroll→rolls
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(答案→)roll→rolls
解析：本文叙述了一只善良且聪明的小狗的故事。
【小题1】考查名词单复数。根据前面twelve十二个面包圈，所以roll要构成rolls .
【小题2】考查动词短语。return 归还=give back；回来=e back，所以应该把returned改成came或者去掉back。
【小题3】考查动词时态。本文整篇都用的是过去的时态，所以此句也是一般过去时，所以want改成wanted。
【小题4】考查连词，本句是一个并列句，根据前后句之间的关系Bobby's owner wants to know what had happened, but he followed Bobby to the baker's shop the next day，是因果关系而不是转折关系，所以but改成so或者and。
【小题5】考查固定短语。Instead of +宾语，代替，instead，做状语，而是，因后面有宾语所以加of .
【小题6】考查固定短. as usual,像往常一样，所以usually改成usual。
【小题7】考查形容词的比较等级。本句句意：一只很可怜的小狗。没有比较的对象，所以不用比较级，所以poorer改成poor。
【小题8】考查主被动。本句句意：鲍比把面包圈给了那只可怜的小狗。offer sth to ,把某物给…,所以把was去掉，构成主动式。
【小题9】考查代词。本句句意：鲍比的主人以它为自豪并奖励给它一块大骨头。是主人奖励它，所以宾语是it，而不是它自己，所以itself改成it。
【小题10】考查非谓语。根据：介词 + doing，所以把tell改成telling。