阅读与回答问题(本题共5小题；每小题2分，满分10分)
请认真阅读下面短文，并根据短文内容回答问题。
One afternoon, many years ago, I went to pick up my mother from work. I got there a little early so I stopped the car by the roadside and waited for her.
As I looked out of the car window, there was a small park where I saw a little boy, around two years old ,running freely on the grass as his mother watched from a short distance. The boy had a big smile on his face as if he had just been set free from some sort of prison(监狱）.The boy would then fall to the grass, get up and without looking back at his mother, still with a smile on his face.
At that moment ,I thought to myself, “Why can’t most adults this way?” Most adults,when they fall down, they would be so embarrassed that they would not try again if someone saw them fall. They would end up too afraid to try again for fear of failure.
Kids, when they fall down, they don’t consider their falling down as failure, instead, they treat it as a learning experience. They try and try again until they succeed. While I was touched by the boy's persistence, I was also touched by the manner in which he did. I learned a lot from that   and have successfully brought that lesson with me in my many pursuits（追求) in life.
What did the boy’s mother do when the boy was running freely on the grass?
                                                
How would adults feel when someone saw them fall?
                                                
What do kids often treat their falling down as?
                                                
What was the writer deeply impressed by?
                                                
What do you think failure is?(请自拟一句话作答)