语法填空（共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卡标号为1~10的相应位置上。
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 see ___1___ animal would find them first.
The ___2__ (cheer) and optimistic rabbit threw himself into looking for the carrot, __3___ (dig) here and there, totally convinced that he would find it. But the dog, after sniffing around for a bit, ___4___ (lie) down and began to complain about how difficult it, 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 __8___ the dog had been lying all the time. 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.