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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.
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Article: Compassion is a desire within us to help others. With effort, we can translate compassion into action. An experience last weekend showed me this is true. I work part-time in a supermarket across from a building for the elderly. These old people are our main customers, and it's not hard to lose patience over their slowness. But last Sunday, one aged gentleman appeared to teach me a valuable lesson. This untidy man walked up to my register with a box of biscuits. He said he was out of cash , had just moved into his room, and had nothing in his cupboards. He asked if we could let him have the food on trust. He promised to repay me the next day. Icouldn't help staring at him. I wondered what kind of person he had been ten or twenty years before, and what he would be like if luck had gone his way. I had a hurt in my heart for this kind of human soul, all alone in the world. I told him that I was sorry, but store rules didn't allow me to do so. I felt stupid and unkind saying this, but I valued my job. Just then, another man, standing behind the first, spoke up. If anything, he looked more pitiable. "Charge it to me," was all he said. What I had been feeling was pity. Pity is soft and safe and easy. Compassion, on the other hand, is caring in action. I thanked the second man but told him that was not allowed either. Then I reached into my pocket and paid for the biscuits myself. I reached into my pocket because these two men had reached into my heart and taught me compassion.
Answer: could not afford anything more expensive
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The aged gentleman who wanted to buy the biscuits _ .

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Article: Sudan is a rather large nation in the northeastern part of Africa. It has about twenty million people. It also has a short coastline along the Red Sea. Some northern areas of the country have deserts while the southern part has tropical rain forest. Their capital city is Khartoum. At Khartoum the Blue Nile and the White Nile come together to form the Nile River, which is the world's longest river. Khartoum has about four hundred and seventy thousand people. There are two groups of people who live in Sudan. In the northern part of the country, there are many Arabic-speaking Muslims. They make up about two-thirds of the total population. In the southern area, there are groups of people who speak African languages. The northern and southern areas also have different histories. People in the south lived by themselves for many years. However, the northern area was controlled by foreigners for several centuries. After the World War II, Sudan became completely independent.
Answer: 2%
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People living in the capital city of Sudan make up more than _ of the total population.

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Article: What a great project this is, building your own greenhouse! If you're a gardener, then a greenhouse is necessary no matter where you live. As long as you've got some good plans, it's possible to build a backyard greenhouse within just a few days. It's a great way to impress the neighbors! Metal greenhouses are practical, I agree, but they look ugly. If you build your own backyard greenhouse from wood, you'll end up with a lovely looking Victorian-style greenhouse, which will last very long if you treat it with the correct wood protection. Of course you'll save a lot of money in the process too. How much exactly? It's difficult to say as it depends on how much glass costs where you live. After all, there isn't much wood required, as it's only the actual frame that is wooden. To make sure you save the most money, it's best to take your plans to wherever you plan to buy your materials. That way you won't end up wasting any money on unnecessary materials. To be honest, saving money is not the main reason for building your own greenhouse. It's the fun you'll get from building it and the pleasure you'll get from showing it off to your friends and family that makes the project worth doing. Nothing beats the feeling when someone asks you where you bought something and you turn around and say "Oh, actually, I built it myself!" That feeling is priceless! You'll never feel like that over something you've bought!
Answer: a brick greenhouse
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According to the author, it is better to build _ .