题目内容：

    A group of boys gathered around a tree. “What a tall tree!” they said to each other. “It would be exciting to climb to the top!”

The group of boys then d1. to play a game to see who could climb to the top of the tree first. Their mothers were siting not far away, looking on at their children as they played.

One of the climbers was an 8-year-old boy named David. He was the shortest c2. in the group. Nobody thought he would win the competition.

Then the game s3.. All of the boys tried their best to climb as high as they could. Although they all made it halfway up the tree before David did, he reached the top of the tree f4. in the end.

His mother was proud to see this. She asked him, “David, how did you manage to reach the top of the tree so q5.?”

“It was easy,” David said. “The other children kept looking down as they climbed. When they realized how high they were, they got scared and were a6. of falling down. I, however, looked only up. When I saw how close I was, I kept going higher and higher until I reached the top.”

It is true in life that if we just keep going forward without looking back, we are more likely to reach our goals for success.