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: Who Owns the Moon? Within the next ten years, the U. S., China, Israel, and a crowd of private companies plan to set up camp on the moon. So if and when they plant a flag, does _ give them property rights? A NASA working group hosted a discussion this week to ask: Who owns the moon? The answer, of course, is no use. The Outer Space Treaty, the international signed by more than 100 countries, states that the moon and other celestial bodies are the province of all mankind. No doubt that would annoy all of the people throughout the ages, like monks from the Middle Ages, who have tried to claim the moon was theirs. But ownership is different from property rights. People who rent apartments, for example, don't own where they live, but they still hold rights. So with all of the upcoming missions to visit the moon and beyond, space industry thought leaders are seriously asking themselves how to deal with a potential land rush. " This is a very relevant discussion right now. We've got this wave of new lunar missions from around the world," said William Marshall, a scientist in the small-spacecraft office at NASA, but who spoke this week at an event hosted by NASA's Co Lab, a collaborative public-private working group. He was speaking from his personal interest and not on behalf of the agency. To be sure, the United States aims to send astronauts back to the moon by as early as 2015, in a mission that would include a long-term settlement. China and Israel, among others, are also working on lunar projects. And for the first time, several private groups are building spacecraft to land on the moon in an attempt to win millions of dollars in the Google Lunar X Prize. Some participants say that they plan to gain some property rights in the mission.
Answer: no one can answer the question " Who owns the moon?"

A: In the passage the writer seems to be worrying that _ .
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Q: Article: There was once a farmer who lived near a road. It was not a busy road,but from time to time,cars passed the farm. Near the farm gate, there was a large hole in the road. this hole was always full of water, and the drivers of the cars could not see how deep the hole was. They thought it was probably not deep.So when they drove into the hole, they could not drive out because it was so deep. The farmer did not spend much time working on his farm. He spent most time watching the hole. Whenever a car drove into it, he would pull the car out with his tractor and he would charge the drivers for much more money than they had expected. One day, a driver of a car said to him, "You must have made a lot of money pulling cars out of this hole night and day." "Oh no," the farmer said, "I don't pull cars out of the hole at night. At night I fill the hole with water."
Answer: liked very much driving through water

A: Many cars went into the hole because the drivers _ .
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Q: Article: A single night of taking the drug Ecstasy can cause serious brain damage and speed up the start of Parkinson's disease , scientists say. Just two or three Ecstasy tablets can permanently destroy brain cells that affect movement and reasoning, according to American research that links the drug to Parkinson's for the first time. A study by a team at Johns Hopkins University in Baltimore, Maryland, involving squirrel monkeys and baboons found that both species suffered permanent damage to key cells, which are lost in Parkinson's, after receiving three low doses of Ecstasy at three-hour periods. The study is particularly important because baboons are one of the best animal models for the human brain. George Ricaurte, who led the research, said that the widespread abuse of drug might have caused severe damage. "The most troubling result is that young adults using Ecstasy may be increasing their risk of developing Parkinsonism as they get older." Alan Leshner, a former director of the US National Institute on Drug Abuse, said, "This study emphasizes the multi-aspect damage that Ecstasy causes to users. We've long known that repeated use damages brain cells. But this study shows that even very occasional use can have long-lasting effects on many different brain systems. It sends an important message to young people: don't experiment with your own brain." Janet Betts, a mother whose teenage daughter Leah died after a single Ecstasy tablet in 1995, said, "This comes as no surprise. But people can't see the effects at first, and they say it won't happen to them. We'll see the symptoms later, just as we have with smoking."
Answer: warn young people of the risk of taking the drug Ecstasy

A:
The article is intended to _ .
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