题目内容：

A farmer once organized a competition between his dog and his rabbit. He dug a hole in one of his biggest fields, and hid a carrot and a bone in it. He wanted to find out 1.  animal would find them first.

The cheerful and   2. (ambition) rabbit threw himself into looking for the carrot, digging here and there, totally 3.  (convince) that he would find it. But the dog, after sniffing around for a bit, lay down and began to complain about how difficult4.  was to find one bone in such a big field.

The rabbit dug  5.  hours, and with every new hole the dog complained even more about how difficult this was, even for the rabbit.   6.  the rabbit thought that each hole dug was one hole less that needed digging. When there was no place in the whole field  7.  (leave) to dig, the rabbit dug a tunnel right to the place where the dog 8.  (lie) since he lay down. There he found the carrot and the bone.

This is how the dog lost the game. He had come to 9.  right place at the very beginning but failed to find the bone  10. he only complained and didn’t try at all.