阅读下面短文，从短文后所给的A、B、C三个选项中选出能填入相应空白处的最佳选项。
One day, a little boy decided to dig a hole behind his house after watching a science programme. As he was 1, some boys stopped by to watch. "What are you doing?" asked one of them. "I want to dig a deep hole all the way through the 2! " the boy answered excitedly.
The older boys began to laugh, telling him that it was 3 to do it. Then they left.
The little boy kept on digging and digging. Suddenly, a few small colourful stones caught his eye. He 4 them and put them into a glass jar patiently. Humming a song, he 5 digging. The jar was full soon. Then he talked to himself calmly (冷静地) and proudly, Maybe I can't finish digging all the way through the earth, but look at what I have 6 in the process of digging!”
The boy's goal (目标) was too 7, but it did cause him to go on, to keep working.
Not every goal will be achieved. Not every job will end up with a 8. Not every dream will come true. However, when you can't achieve your goal, you can say, "Yes, but look at what I've found along the way! They come into my life because I 9 to do something!" It is in the digging that life is lived. It is the unexpected 10 on the journey that really has a meaning.