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: Quick and Quack were two brave little ducks who lived with their mother. Both were really fast and were always competing against each other. One day, after visiting their uncle Ducklass, Quack shouted, "Last one home is a goose!" and both ducks swam quickly down the river. They both knew the way well, but Quack had been preparing a trick for some time. He had realized that the current in the middle of the river was stronger, and would help him. So, even though Mother Duck had told them never to swim in the middle of the river, Quack paddled over to it. "I'm old enough now to swim here," he thought to himself. It wasn't long before he realized his mother had been right. He was going much faster than Quick, and was developing a big lead. Quick was not amused. He never disobeyed his mother, and now he was going to lose the race! As they went on, the current got stronger. Quack proudly crossed the finishing line, without realizing he headed straight for a big whirlpool in the middle of the river. Before he could react, he was turning around in it, unable to escape. No duck was strong enough to swim in those waters, and poor Quack kept swallowing water. The fact that he was struggling hard didn't help matters much either. Fortunately, a cow from a nearby farm came by, and seeing Quack, he jumped in and rescued him. When he was on dry ground, he remained uncomfortable for quite some time. That provided quite a laugh for different animals that had been watching.
Answer: Quack was quite sure of his success

A: Before the race in the river began, _ .
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Q: Article: Cheaters called "pirates" often use camcorders and cell phones to make illegal copies of blockbusters in the local theater. These pirates then sell those recordings on the street or over the Internet for very low prices. Some share them for free. "It's unfair for people to pirate movies, " says 15-year-old Hadaia Azad Ezzulddin. Movie piracy "takes money out of the pockets of thousands of people in the movie industry," she notes. Victims include famous actors and directors as well as local theater owners and their employees. Hadaia came up with an idea that could help stop movie piracy. Hadaia's idea uses infrared light. This range of light is invisible to the human eye. It is visible, however, to many types of cameras. Theater owners could place small infrared lights on their movie screens. The lights would not disturb people watching the movie. It would, however, distort the recordings made by many types of cameras. To test her idea, Hadaia built a box with a movie screen inside. Then, she projected images on that screen through a hole in the box. She took recordings of those images, using nine different types of cameras. These included the types found in cell phones as well as camcorders. During some tests, she also turned on light emitting diodes , or LEDs. The LEDs were embedded in a certain place behind the movie screen. They gave out infrared light. Sure enough, she showed, a pirated movie included odd stripes or spots if it had been recorded while the LEDs were on. It might be possible to use the LEDs to flash the date and time on the movie screen. The information would then appear in the illegal recordings. Theater owners or police might use the information to track down the pirates. Cutting down on piracy might get more people into theaters to watch the real movie instead of an illegal copy. Six out of every ten films now produced aren't profitable. They don't make enough money to recover how much was spent to make and market them. Such a poor payback can discourage filmmakers from producing anything but the types expected to become blockbuster hits. It might also keep smaller theaters from showing a wider variety of movie types.
Answer: make illegal copies of movies unpleasant to see

A: Infrared lights are put on the movie screens to _ .
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Q: Article: Walk along The Mall towards the royal residence to see one of London'S best known views.If you time it right and arrive at 11:30,you'll be able to see the changing of the guard.During August and September,the Palace's State rooms are open to the public.These rooms are used by the Royal Family on ceremonial occasions and are lavishly furnished with some of the finest English and French furniture you cann't see anvwhere in the world.While at the Palace you can also visit The Queen'S Gallery and enjoy some of the finest paintings and works of art from the Royal Collection.If you havetime.St.James'S Park,which runs'alongside The Mall,is worth a visit if only for the Delicans on the lake.The birds have been a constant feature of the park since the late 17thcenturv.Behind the Palace is the Royal Mews,with houses--the Queen'S working stables .Here visitors can see the State Carriages and Coaches,as well as their horses. Address:Buckingham Palace Road,SWl A Telephone:020--7766--7300/7301 Open: Changing of the Guard:11:30,daily until the end of June and every other day in the rest of the year. Buckingham Palace:every day,31 July--26 September,09:30--16:30. The Queen'S Gallery:every day,09:30--17:30. Cost: Buckingham Palace:Adult 12.50;ConcessionsPS10.50;Under 17PS6.50. The Queen's Gallery:Adult~7.50;ConcessionsPS6.00;Under 17PS4.00.
Answer: in a student's textbook

A:
You can read this passage most probably _ .
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