TASK DEFINITION: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
PROBLEM: Article: A green house is a building made of glass which is used for keeping warm when the outside temperature is low. In a similar way there are several gases in the atmosphere (mixture of gases that surround the earth) which trap the heat produced by the sun and prevent it from escaping. These gases are known as "greenhouse gases". And the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere, and without them the earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us. The problem is that in the last century and a half, we have been putting too many of these gases into the earth's atmosphere by burning large quantities of coal and oil and by cutting down forest. The rapid increase in greenhouse gases is making the world warmer. The world's temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide in the atmosphere doubles, there will probably be a rise in the earth's temperature of between I and 4degC;. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we are probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.
Answer: a natural course that is to a certain degree useful to us

SOLUTION: According to the passage, we can know "greenhouse effect" means _ .

PROBLEM: Article: Play allows children to use their creativity while developing their imagination and physical, cognitive , and emotional strength. Play is important to healthy brain development. Play allows children to create and explore a world they can master, conquering their fears while practicing adult roles. Undirected play allows children to learn how to work in groups, to share, to negotiate, and to resolve conflicts. Ideally, much of play involves adults, but when play is controlled by adults, children acquiesce to adult rules and concerns and lose some of the benefits play offers them, particularly in developing creativity, leadership, and group skills. In contrast to passive entertainment, play builds active, healthy bodies. In fact, it has been suggested that encouraging unstructured play may be an exceptional way to increase physical activity levels in children, which is one important strategy in the resolution of the obesity problem. Children's development is critically influenced by appropriate, affective relationships with loving and consistent caregivers as they relate to children through play. When parents observe their children in play or join with them in child-driven play, they are given a unique opportunity to see the world from their children's vantage point as the child navigates a world perfectly created just to fit his or her needs. The interactions that occur through play tell children that parents are fully paying attention to them and help to build enduring relationships. Parents who have the opportunity to look at their children's world learn to communicate more effectively with their children and are given another setting to offer guidance. Less verbal children may be able to express their views, giving their parents an opportunity to gain a fuller understanding of their perspective. Quite simply, play offers parents a wonderful opportunity to engage fully with their children. Play is essential to the academic environment. It ensures that the school setting attends to the social and emotional development of children as well as their cognitive development. It has been shown to help children adjust to the school setting and even to strengthen children's learning willingness. Social-emotional learning is best integrated with academic learning; it is concerning if some of the forces that enhance children's ability to learn are improved at the expense of others. Play and unscheduled time that allow for peer interactions are important components of social-emotional learning.
Answer: doesn't help develop leadership and group skills

SOLUTION: Compared with undirected play, play which is controlled by adults _ .

PROBLEM: Article: Barefoot and dirty, the girl just sat and watched the people go by. She never tried to speak. Many people passed, but never did one person stop. The next day I decided to go back to the park, curious to see if the little girl would still be there. Right in the very spot as she was yesterday, she sat with the saddest look in her eyes. Today I was to make my own move and walk over to the little girl. As we all know, a park full of strange people is not a place for young children to play alone. As I began walking towards her, I could see the back of the little girl's dress indicated a deformity . I smiled to let her know it was okay, I was there to help, to talk. I sat down beside her and opened with a simple "Hello". I smiled and she shyly smiled back. We talked until darkness fell and the park was completely empty. I asked the girl why she was so sad. The little girl looked at me and with a sad face said, "Because I'm different." I immediately said "That you are!" and smiled. The little girl acted even sadder. She said, "I know." She looked at me and smiled. Slowly she stood to her feet, and said, "Really?" "Yes, dear, you're like a little guardian angel sent to watch over all those people walking by." She nodded her head "yes" and smiled, and with that she spread her wings and said with a twinkle in her eye, "I am. I'm your guardian angel." I was speechless, sure I was seeing things. She said, "For once you thought of someone other than yourself, my job here is done." Immediately I stood to my feet and said, "Wait, so why did no one stop to help an angel!?" She looked at me and smiled, "You're the only one who could see me, and you believe it in your heart." ...and she was gone. And with that my life changed dramatically. So, when you think you're all you have, remember, your angel is always watching over you. Mine is!
Answer: they knew the author would help her

SOLUTION:
People just passed by the girl because _ .