阅读下面的短文，掌握其大意，然后从各题所给的A、B、C三个选项中，选出一个最佳答案.

    There was a tree in my garden. One day, two birds came to the tree and built a house for their1 newborn babies.

    One morning, I was getting up when I 2the sound of the little birds. I ran out of my bedroom and found two babies eating food on the ground in the 3I thought they dropped off their house, so I decided to help them get back to their house. At that time, the 4bird and the mother bird came back. They brought some food for the third baby. They put it on the ground. 5 their third baby. To get the food, she had to fly to it. Although she was6, she was afraid of getting out of the house to eat it.

    To my 7. her parents just stood there and did nothing.

    After about ten8 the third baby bird didn't have any other choice. She slowly went to the border(边缘)of the house and began to9, She flew down from the house. Finally, she landed safely on the ground and found the food soon.

These birds taught us a lesson: If we want our food, we will have to learn to fly on 10.