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: Let us say there is something you don't know how to do. In the past if you were determined to learn, you might have called friends or s, taken a night class or walked down to the local library for a research term. But now a host of websites are springing up to provide free practical advice on these subjects and actually anything else you can think of. In one sense, these" how - to" sites represent a part of the growing world of online learning. These FAQs(Frequent Answers and Questions), many of which still circulate(go round continuously), took a special subject and explained it to complete _ . But, "how - to" sites take the FAQ idea in a somewhat different direction by addressing subjects that aren't necessarily associated with discussion forums .These sites take the style of a written tutorial and a tone of friendly advice. Possibly the biggest and best known of these sites is learn 2.com(www. learn2. com)It offers nearly 1, 000 free tutorials and adds new ones frequently for a job interview. At ehow. com(www. ehow.)you can learn how to train for your first marathon, how to buy a vacation home, or how to make a movie in eight steps.
Answer: help you to solve any difficulty you meet with

Ex Output:
The purpose of the passage is to _ .

Ex Input:
Article: Australian sleep researchers have developed a set of hi-tech "sunglasses", described as the world's first "time control" glasses, which can imitate sunlight patterns. The team, from Flinders University, in Adelaide, says the glasses send out a soft green glow that helps a traveller adapt to changing sleep patterns and time zones in "small steps". It targets a part of the brain that regulates the human body-clock, by sending signals to the rest of the body that help it slowly realise it is in a different area of the world. It has been suggested the device, called the "Re-Timer", is currently the only wearable body clock adjustment system commercially available. Scientists say the device, officially launched in South Australia, can help ridf the negative effects of long-timel travel and bring new relief to insomnia sufferers, shift workers and even teenagers. "The light from Re-Timer stimulates the part of the brain responsible for regulating the 24-hour body clock," said Prof Leon Lack, its chief inventor. Extensive research has shown that green light is one of the most effective wavelengths for influencing the body clock. The battery-powered device, which retail for PS162 in Britain, then sends signals that cause the production of hormones and daily cycles known as circadian rhythms . Those people who want to sleep peacefully, but wake earlier, should wear it for 50 minutes in the morning for three days. Those who want a lie- in, should wear it for the same time before bed to delay the body clock. The device, which is powered by an inbuilt rechargeable battery, can also be worn as sunglasses during daily tasks such as reading or using a computer. "The glasses have been designed to be user friendly and comfortable to wear so people can go about their normal activities wearing them at work or at home," he said, adding they had been designed based on 25 years of university research. It is estimated that up to 94 per cent of long-time travellers suffer from jet lag because the body becomes confused to travelling through different time zones. So the glasses are good news to them. It uses the outside world as indicators as to whether it should be awake or asleep including factors such as light, silence or noise. Airlines are said to be seeking a "silver bullet" for the tiredness and confusion that often follow a long-timel flight and are in discussions to buy the device.
Answer: motivating part of the brain

Ex Output:
The "time control" glasses work by _ .

Ex Input:
Article: Forget chip fat, sugar cane or rapeseed oil -- the latest source of biofuel could be watermelons. Scientists have discovered that the fruit is a great source of sugar that can be readily distilled into alcohol to power cars and farm machinery. And sellers reject 360,000 tons of "substandard" fruit every year in America alone which could be used as an economical way to make fuel. The waste from US growers could produce nearly two million gallons (nine million litres) of biofuel per year. In the study, researchers at the United States Department of Agriculture set out to determine the biofuel potential of juice from rejected watermelons --those not sold due to imperfections, and currently ploughed back into the field. About a fifth of each yearly watermelon crop is left in the field because of surface blemishes or because they are misshapen. Dr. Wayne Fish, who led the team, found that 50 percent of the fruit was fermentable into alcohol which could provide valuable fuel. "We've shown that the juice of these watermelons is a source of readily fermentable sugars, representing an unexploited raw material for alcohol biofuel production," he said. The study, published in the journal Biotechnology for Biofuels, discovered that watermelons could produce around 20 gallons of fuel per acre from fruit that otherwise would go to waste. Production of biofuels has been targeted by Western governments as a way to support renewable energy targets. The European Union has a target for 2010 that 5.75 percent of transport fuels should come from biological sources, but the target is unlikely to be met. The British government's Renewable Transport Fuel Obligation requires five percent of the fuel sold at the pump by 2010 to be biofuel.
Answer: watermelons could be used to make fuel

Ex Output:
The passage mainly tells us _ .