阅读下面一篇短文，从短文后各题所给的A、B、C三个选项中，选出可以填入空白处的最佳选项。
Once there was a shepherd boy who had to look after a group of sheep.One day, he felt 1 and decided to play a trick on the villagers. He shouted,"Help! Wolf! Wolf!"
The villagers 2 his cries and rushed out of the village to help the shepherd boy. When they reached him, they asked,"Where is the wolf?"The shepherd boy laughed 3 , "Ha, ha, I fooled all of you. I was only playing a trick on you."
A few days later, the shepherd boy played this trick 4 .
Again he cried,"Help! Help! Wolf! Wolf!"Again, the villagers rushed up the hill to help him and again they found that boy had tricked them. They were very 5 with him for being so naughty.
Then, some time later, a wolf went into the field. The wolf attacked one sheep, and then another and another. The shepherd boy ran towards the village 6 ,"Help! Help! Wolf! Help! Somebody!"
The villagers heard his cries but they laughed 7 they thought it was another trick. The boy ran to the nearest village r and said,"A wolf is attacking the sheep. I lied before, but this time it is 8 !"
Finally, the villagers went to look. It was true. They could see the wolf 9 and many dead sheep lying on the grass.
From the story we know people may not believe someone who often tells 10 , even when he tells the truth.
