请先阅读下面短文，掌握其大意，然后从各小题所给的A、B、C、D四个选项中选出可以填入相应空白处的最佳选项，并在答题卷上将该项涂黑。One day a little boy asked his father, "What does the word ‘great' mean? Who are great people and 1 do they become great? "
The father asked his son to bring two plants and then told him to plant one of them 2 the house and the other outside the house. The boy did as his father said.
The father asked his son, "Which one of the two plants do you think will be 3 and bigger? " The boy replied, "The plant inside the house will be safer, 4 it will grow bigger, while the plant outside the house is not safe at all. No one will be there to 5 it. It may be eaten by animals."
The father smiled and said, "Let's wait 6 .We will know the answer."
Then the boy 7 for study and after four years he came back to his house. He said to his father, "Look, 8 happens to this plant inside the house and it is safe."
When the boy went outside, he was very 9 to see a big tree. The boy couldn't believe his eyes. He couldn't 10 how the plant outside was able to grow much bigger than the plant inside the house.
"The plant outside the house faced four 11 and many difficulties!" the father 12 to his son why the plant outside was bigger. "The plant inside was safe, it didn't face weather changes, and it didn't get proper 13 , so it didn't become big."
Here is the 14 to the question about being great: 15 a great person, one must have failed many times, experienced many difficulties and overcome those difficulties. After that, he is able to become great.
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