阅读下面短文,从短文后所给的A、B、C、D 四个选项中,选出能填入相应空白处的最佳选项。There was a successful old farmer who grew tomatoes for many years. One day, his grandson told him, "Grandfather, I want to 1 great things in life and make all of my dreams come true. What are the things I should avoid?"The farmer thought for a moment and said, "First of all, you shouldn't be afraid to fall. Secondly, don't ever fool yourself, but the most important of them all, I will tell you at the proper time. "
One week later, the farmer took his grandson to his 2 for the first time. He showed him a large place where he grew tomatoes. When the farmer saw how 3 the little boy was, he asked him, "How do you see them?"The boy replied, "They look very healthy. Their leaves are green and their fruits are smooth and red. "The farmer smiled. Then he took him to another small place and asked, "How about these ones?Can you 4 them with the others?"The boy shook his head and said, ""They don't look healthy. Their leaves are yellow and they haven't developed any fruit yet. What do you 5 the reason?"The farmer said, "That's because these weeds are competing with the main 6 for nutrients in the soil. "
Then the farmer held his grandson 7 his arms and said, "Now is the time to answer your question completely. The most important thing you should avoid to become 8 in life are negative people. These people are like the weeds. And they would stop you from reaching your dreams. They have 9 to offer as they like complaining. So you should stay away from such kind of people. Be around people who bring a smile to your face and fill your heart with joy. Choose your friends 10 and they will never put you down. "