题目内容：

Once upon a time a farmer had a dog and a rabbit. One day he 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 for hours, and with every new hole the dog complained even more about how difficult this     5.   (be), 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.