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: We all enjoy the colors of autumn leaves. Did you ever wonder how and why a fall leaf changes color? Where do the yellows and oranges come from? To answer those questions, we first have to understand what leaves are and what they do. Leaves are nature's food factories. Plants take water from the ground through their roots. They take a gas called carbon dioxide from the air. Plants use sunlight to turn water and carbon dioxide into glucose, which is a kind of sugar. Plants use glucose as food for energy and as a building block for growing. The way plants turn water and carbon dioxide into sugar is called photosynthesis, which means " putting together with light. " A chemical called chlorophyll helps make photosynthesis happen. Chlorophyll is what gives plants their green color. As summer ends and autumn comes, the days get shorter and shorter. This is how the trees "know" to begin getting ready for winter. During winter, there is not enough light or water for photosynthesis. The trees will rest, and live off the food they stored during summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green fades away, we begin to see yellow and orange colors. Small a-mounts of these colors have been in the leaves all along. Covered up by the green chlorophyll, we just can't see them in summer. The bright reds and purples we see in leaves are made mostly in the fall. In some trees, like maples, glucose is trapped in the leaves after photosynthesis stops. Sunlight and the cool nights of autumn cause the leaves turn this glucose into a red color. The brown color of trees like oaks is made from wastes left in the leaves. It is the combination of all these things that make the beautiful colors we enjoy in the fall.
Answer: introduce the topic of the passage
The writer asked two questions in the beginning in order to_.

Article: Games are a good form of teaching or training children as they combine fun with knowledge. They make the teaching or training activities more interesting. They are useful in all fields of teaching and training. Help your child discover just how much more is going on in the world around them with this listening game. It will also provide a few minutes of peace and quiet in what is probably a very noisy and busy day. A discussion of the sounds you each hear will also assist in language development and an ability to articulate that which was heard. The sit-and-listen game is especially helpful if your child is at the stage of developing language skills: listening, speaking and so on. Method: This is a very relaxing activity in which you both need to sit still and silent for about 30 seconds and just listen to the world around you. You are both trying to hear as many different things as you can, whether they are cars, people, airplanes, water running, the wind in the trees or any other kinds of daily sounds. After the given time is up, having a chat about what you both could hear. It is a good idea to ask your little one some open ended questions to promote their language development, such as: "What were the loudest sounds you heard?" "What were the closest sounds you heard?" "How many cars did you hear?" "How far away do you think that barking dog might live?" "What sounds did you hear which you did not expect to hear?" Note: As an extension activity you may wish to draw a picture of all the things you could hear.
Answer: your child's language ability
The sit-and-listen game is intended to develop _ .

Article: When the Japanese attacked America's ships at Pearl Harbor on 7 December 1941,they did it secretly.The makers of the movie Pearl Harbor have behaved differently. The noise about Pearl Harbor,made by Disney,has reached its highest point with its premiere before the movie opens in cinemas across the US at the start of the Memorial Day holiday weekend,a time to recall national heroes who sacrificed their lives on the battlefield. As Ben Affleck is the main star,the movie seems sure to become a success in the United States at least. At almost three hours in length,it promises to be a good old Hollywood movie.There is a love story.Affleck and his co-star,Josh Hartnett,both fall in love with the navy nurse,Kate Beckinsale and,of course,there is much human courage and love of country. It's certain that Disney will be accused of "changing" history.The showing of actual events in a movie always causes arguments. Bits of the story are deliberately not mentioned in the movie.It does not address the theory held by some historians that President Franklin Roosevelt knew about Japan's intention to attack the ships in Pearl Harbor.It is said he did nothing,as he was aware that such a blow would allow him to take America into the Second World War. Japan remains sensitive about being accused of wartime atrocities .And Disney is sensitive about its business in Japan,where it has a theme park. Not all the reviews of the movie have been full of praise.A reviewer for Newsweek,who was given an early preview,acknowledged that the 40-minute sequence showing the attack itself was powerful.The attack comes quite late in the movie,however,and the reviewer was less impressed with the characters and the love story. "Almost every line of the dialogue sounds like it comes from an old movie," the reviewer wrote.
Answer: a day when people celebrate the victories of World War II
From the passage we can infer that the Memorial Day refers to _ .