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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.
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Article: Going on a road trip? The St. Louis Arch, Statue of Liberty and Golden Gate Bridge are normal tourist sites. But if you prefer offbeat destinations, check out the following road-side attractions. World's Largest Ball of Paint Alexandria, Ind. In 1977, Michael Carmichael set out to create the biggest ball of paint anywhere. Starting with a baseball as a center, he painted layer after layer of paint day after day, year after year. The ball weighs more than 1,300 pounds, with more than 20,000 coats of paint, which is recognized by Guinness world Records. Visitors can paint the ball themselves and become part of history. The Museum of Dirt Boston, Mass. The museum is the idea of Glenn Johanson. Labeled glass bottles contain such treasures as dirt from the Great Wall of China, as well as sand from a desert in Saudi Arabia and Omaha Beach in France. Best of all, the cost of seeing this museum is dirt cheap: It's free. Mount Horeb Mustard Museum Mount Horeb, Wis. It's heaven for hot dog lovers! This museum claims to have world's largest collection of prepared mustard . Its more than 4,100 bottles of spices come from 60 nations, including Turkey and Tibet. Visitors learn the history of mustard, from how it's made to how it's advertised and sold. The museum's creator, Barry Levenson, loves mustard so much, he even puts it on ice cream! Paper House Rockport, Mass. Swedish immigrant Ellis Stenman was much ahead of his time in 1922, when he started to build a two-room house almost entirely out of newspaper. At the time, people didn't give much--if any --thought to recycling paper. In fact, "recycling" wasn't even a Word yet. The house is framed with wood, but the walls are made of 215 layers of newspaper. In all ,he used about 100,000 newspapers.
Answer: World's Largest Ball of Paint
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If you want to add your own work to what you visit, you may choose_.

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

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Article: In England three foreign gentlemen came to a bus stop. They studied the information on the post sign and decided which bus to take. About five minutes later the bus they wanted came along. They prepared to get on. Suddenly people rushed onto the bus and tried to push them out of the way. Someone shouted _ remarks about the foreigners. The bus conductor came rushing down the stairs to see what all the trouble was about. The three foreign gentlemen looked puzzled and ashamed. No one had told them about the British custom of lining up for a bus so that the first person who arrived at a bus-stop is the first person to get on the bus. Learning the language of a country isn't enough. If you want to ensure a pleasant visit, find out as much as possible about the manners and customs of your hosts. You will probably be surprised just how different they can be from your own. A visitor to India would do well to remember that people there consider it impolite to use the left hand for passing food at table. The left hand is supposed to be used for washing yourself. Also in India, You might see a man apparently shaking his head at another and assume that he is disagreeing. But in many parts of India a rotating movement of the head is a gesture that express agreement or acceptance. _ In that country you shake your head to express "yes" -- a nod means "no". In Europe it is quite usual to cross your legs when sitting, talking to someone, even at an important meeting. Doing this when meeting an important person in Thailand, however, could cause offence . It is considered too informal an attitude for such an occasion. Also when in Thailand avoid touching the head of an adult -- it's just not done. Attitudes to women vary considerably around the world. In Japan, for example, it is quite usual for men to plan evening entertainments for themselves and leave their wives at home. Knowing about customs and attitudes is useful when you are travelling, but you also need to know the language used to express different degrees of formality .
Answer: they thought they were looked down upon
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The three foreign gentlemen looked puzzled and ashamed because _ .