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.

Ex Input:
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

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

Ex Input:
Article: It was a very foggy day in London. The fog was so thick that it was impossible to see more than a foot or so. Buses, cars and taxis were not able to run and were standing by the side of the road. People were trying to find their way about on foot but were losing their way in the fog. Mr. Smith had a very important meeting at the House of Commons and had to get there but no one could take him. He tried to walk there but found he was quite lost. Suddenly he bumped into a stranger. The stranger asked if he could help him. Mr. Smith said he wanted to get to the Houses of Parliament. The stranger told him he would take him there. Mr. Smith thanked him and they started to walk there. The fog was getting thicker every minute but the stranger had no difficulty in finding the way. He went along one street, turned down another, crossed a square and at last after about half an hour's walk they arrived at the Houses of Parliament. Mr. Smith couldn't understand how the stranger found his way. "It is wonderful," he said. "How do you find the way in the fog?" "It is no trouble at all to me," said the stranger, "I am blind."
Answer: meet by chance

Ex Output:
According to the passage, we can infer that "bump into" means _ .

Ex Input:
Article: Outside our hotel in Ho Chi Minh City, Vietnam, a seemingly ancient woman waited beside the door with her hand outstretched. Every day I put my hand in hers as our eyes met. She never failed to return my smile, my grasp, and my greeting. On the last day of our visit, I found myself alone on a busy corner across the street from our hotel. Bicycles and motorbikes rushed in front of me. As I hesitated on the sidewalk, I felt a hand on my elbow and looked down to see the smile of my small beggar friend looking up at me. She nodded her head toward the street, indicating that she would take me across. Together, we moved slowly into the chaos. Then we moved on toward the sidewalk, where she pulled my face down to hers, kissed me on both cheeks, and then left, still smiling and waving back to me. Traveling in poorer nations, I have witnessed a variety of ways to deal with beggars. The most common response of tourists faced with the poverty-stricken is to ignore them and focus their eyes elsewhere. I have seen people push away an outstretched hand in angry annoyance. A few may drop a few coins into the hand in a hurry, hoping that other ragged pursuers won't immediately appear on the scene. For many reasons, giving money is not the best response to an outstretched hand. Many world travelers have discovered that the greatest gift they can give is their time and respect. Everyone needs recognition, to be seen as worthy of being known, to feel appreciated and loved. And I believe that everyone is worthy and worth knowing.
Answer: the author treated her kindly and friendly

Ex Output:
The woman beggars helped the author go across the busy street because _ .