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.

[Q]: Article: Bob Butler lost his legs in a 1965 landmine explosion in Vietnam. He returned home as a war hero. Twenty years later,he proved once again that heroism comes from the heart. Butler was working in his garage in a small town in Arizona on a hot summer day when he heard a woman's screams coming from a nearby house. He rolled his wheelchair toward the house,but the dense bush wouldn't allow him to approach the back door. So he got out of his chair and crawled through the dirt and bushes. "I had to get there,"he says. "It didn't matter how much it hurt." When Butler arrived at the house,he traced the screams to the pool,where a three year old girl,Stephanie,was lying at the bottom. She had been born without arms and had fallen in the water and couldn't swim. Her mother stood over her baby screaming loudly. Butler dove to the bottom of the pool and brought little Stephanie up to the deck. Her face was blue,she had no pulse and she was not breathing. Butler immediately went to work performing CPR to revive her while Stephanie's mother telephoned the fire department. She was told the rescue team was already out on a call .Helplessly,she sobbed and hugged Butler's shoulders. As Butler continued with his CPR,he calmly reassured Stephanie's mother. "Don't worry,"he said. "I was her arms to get out of the pool. It'll be okay. I'm now her lungs. Together we can make it." Seconds later the little girl coughed,regained consciousness and began to cry. As they hugged and rejoiced together,the mother asked Butler how he knew it would be okay. "When my legs were blown off in the war,I was all alone in a field,"he told her." No one was there to help except a little Vietnamese girl. As she struggled to drag me into her village,she whispered in broken English,'It okay. You can live. I be your legs. Together we make it.'" "This was my chance,"he told Stephanie's mom,"to return the favor."
Answer: believed that everything will be OK and he would make it.
[A]: When Butler heard the woman's scream, he _ .

[Q]: 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
[A]: Ethnic groups have preserved their native languages because _ .

[Q]: Article: She is widely seen as proof that good looks can last forever. But, at nearly 500 years of age, _ The health of the famous picture, painted by Leonardo da Vinci in 1505, is getting worse by the year, according to the Louvre museum where it is housed. "The thin, wooden panel on which the Mona Lisa is painted in oil has changed shape since experts checked it two years ago," the museum said. Visitors have noticed the changes but repairing the world's most famous painting is not easy. Experts are not sure about the materials the Italian artist used and their current chemical state. Nearly 6 million people go to see the Mona Lisa every year, many attracted by the mystery of her smile. "It is very interesting that when you're not looking at her, she seems to be smiling, and then you look at her and she stops," said Professor Margaret Livingstone of Harvard University. "It's because direct vision is excellent at picking up detail, but less suited to looking at shadows. Da Vinci painted the smile in shadows." However, the actual history of the Mona Lisa is just as mysterious as the smile. Da Vinci himself loved it so much that he always carried it with him, until it was eventually sold to France's King Francis I in 1519. In 1911, the painting was stolen from the Louvre by a former employee, who took it out of the museum hidden under his coat. He said he planned to return it to Italy. The painting was sent back to France two years later. During World War II, French hid the painting in small towns to keep it out of the hands of German forces. Like many old ladies, the Mona Lisa has some interesting stories to tell.
Answer: they are afraid it will be done further damage.
[A]:
Experts haven't any repairs on the Mona Lisa because _ .