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.

Article: Although most people know there are Seven Wonders in the Ancient world, only few people can name them. This is because most of them are no longer there except the pyramids. However, there is a growing list of wonders of the world today. About nine years ago, UNESCO's World Cultural and Nature Heritage List had 411 places and 136 countries were responsible to protect them, and the list keeps on growing. Usually it is the task of a group of 21 experts to decide which places go on the list. The experts are chosen to work for six years. Their work is to examine and discuss the suggestions from different countries. They also manage the World Heritage Fund which can offer help to countries for protection work. Over the past centuries a lot of cultural or historic places have been destroyed by man or nature. Protecting our natural and cultural heritage is a long and difficult task. Earthquakes, floods, pollution, wars, or even tourism are some of the dangers that harm the heritage. When a historic place is in great danger, it is put on the World Heritage in Danger List and necessary things will be done to protect it. Places which are on the danger list include Historic Bridges of Indiana, St. Elizabeth's Hospital, Rosenwald School in Southern U.S., etc.
Answer: the pyramids
.The Seven Wonders of the Ancient World include _ .

Article: America, has always had people of many different nationalities and languages. The 1990 census indicates that almost 14% of Americans speak a non-English language at home. Yet only 3% reported that they spoke English "not well" or "not at all ". That means that slightly more than one out of 10 Americans could be considered _ . Besides that, many high school and college students---and even some elementary school students---are required to take a foreign language. Actually, a growing number of Americans are coming to appreciate the benefits of using different languages. Ethnic enclaves have preserved the language and culture of American immigrants. Some local residents can function quite well in their native language, without having to bother learning English. Regions such as southern Florida and the Southwest have numerous Spanish-speaking neighborhoods. In fact, Spanish speakers---numbering over 17 million---form the largest non-English linguistic group in America. But Chinese, Vietnamese, Italian, Polish and many other ethnic group add to the linguistic flavor of America. Foreign languages are so commonly used in some ethnic neighborhoods that visitors might think they are in another country! Although some Americans welcome this linguistic and cultural diversity, others have begun to fear that the English language is being threatened. Since the 1980s, the "English Only " movement has sought to promote legislation which would establish English as the "official language" and restrict the use of non-English language. However, some groups, including TESOL, the organization for Teachers of English to Speakers of Other language, object to such "language restrictionism". But so far, 19 states have passed "English Only" legislation, and the topic is the focus of an ongoing debate. Whether or not English is the official language of the United States, it remains the "language of wider communication". Nearly everyone recognizes the need to develop the ability in using English in order to do well in America. American also recognize that English is the international language, and people with good English skills can get by in many international settings. On the other hand, in a world growing increasingly smaller, second language skills can be a great favor. They can build cross-cultural bridges and give people an edge in a variety of career field. Indeed, lack of foreign language skill can limit one's chances for advancement and keep one in a cultural dead-end street.
Answer: their native languages are commonly used in their neighborhoods
Ethnic groups have preserved their native languages because _ .

Article: What were you doing before you started reading this? Were you fully focused on another article? Or eating breakfast? Organizing your day? Or were you staring out of the window, feeling restless and bored? It is likely to have been the latter. Brief moments of boredom are universal, and are frequently what drives us to stop what we are doing and move to something that we hope will be more exciting. But although boredom is common, it is neither unimportant nor favorable, according to Dr John Eastwood, a psychologist at York University, Toronto. Eastwood is the joint author ofThe Unengaged Mind, a major new paper on the theory of boredom. Boredom, he points out in the paper, has been connected with overeating, depression, anxiety, and an increased risk of making mistakes. Mistakes at work might not be a matter of life and death for most of us, but if you are an air traffic controller, pilot or nuclear power plant operator, they most certainly can be. Commercial polo Sami Franks confirms that boredom can make pilots lose attention. "When you fly a lengthy distance, there are two pilots, one of whom is monitoring all the screens while the other does the paperwork, talks to air traffic control and so on. You need to be alert for landing and takeoff, but once you're 500 ft above the runway, the plane's on autopilot and it can be very quiet and boring. In a study I saw of pilots who woke up after a short sleep. 30% of them reported seeing the other pilot asleep too," said Franks. However, Dr Esther Priyadharshini, a senior lecturer in education at the university of East Anglia, has studied boredom and says it can be seen in a positive light. "We can't prevent boredom--it's an unavoidable human emotion. We have to accept it and find ways to control it. We all need downtime. There's no need to be fully busy with work at all times." she says. Children who complain that they have nothing to do on rainy holidays may try to find other things to focus on. The artist Grayson Perry has reportedly spoken of how long periods of boredom in childhood may have improved his creativity. "We all need vacant time to mull things over," says Priyadharshini.
Answer: boredom can be potentially dangerous
We can learn from Eastwood that _ .