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.

Input: Consider Input: Article: Older fathers have uglier children, researchers have claimed after linking age to genetic mutations . The finding comes weeks after leading scientists reported children born to men over the age of 45 run a higher risk of having autism and mental disorders. With age, sperm -producing cells do not copy a man's DNA as effectively, leading to genetic mutations. Martin Fielder, an anthropologist at Vienna University, told the Sunday Times: 'Every 16 years the mutation rate doubles. Other researchers found 25 mutations per sperm in a 20-year-old, but at age 40 it is 65 mutations. By 56, it doubles again. The effect is very visible - someone born to a father of 22 is already 5-10 per cent more attractive than those with a 40-year-old father and the difference grows with the age gap. In contrast, women pass on a maximum of 15 mutations to their baby, regardless of age, according to the study published in the journal Nature. Surveying a group of six men and six women, researchers showed them each 4,018 photographs of 18-20-year-old men and 4,416 of women the same age, and asked to assess their attractiveness. Those with older fathers were consistently considered less attractive. However, the children of older men, though less attractive, are likely to outlive their peers with younger fathers, it is claimed. Professor Lee Smith, a geneticist at Edinburgh University, told the Sunday Times other research found such children have longer telomeres - the caps on the end of chromosomes --- which are associated with longer life. But the mounting research connecting parents' age with autism is cause for concern, experts warn. Autism is an umbrella term for a range of developmental disorders that have a lifelong effect on someone's ability to interact socially and communicate openly. In the UK, around one in 100 adults is thought to be affected by autism, mostly men, caused by a combination of genetic and environmental factors. Researchers said men should be advised about the potential problems in order to help their personal decision-making when it came to having fathering children at older ages. They warned that advancing paternal age faced a risk of 'numerous public health and societal problems'. Among well-known older dads are Simon Cowell, 54, whose son was born earlier this month, and comedian Frank Skinner whose first child was born in 2012 when he was 55.
Answer: When a man becomes older, sperm-producing cells copy his DNA less effectively

Output: From the passage, we know that _ .

Input: Consider Input: Article: Lying on his sickbed in hospital, all 86-year-old Lin Ruiming can do is stare out at a tiny part of sky through the small window. The old man used to ride his motorbike through the busy streets of downtown Beijing. All the while he could only dream of touring the world. He has been suffering from terminal lymphoma since February. As a last gift, his granddaughter,Lin Yifan,asked China's Internet population to give her grandfather a shot at globetrotting . Last week, Lin Ruiming's _ from Sydney Harbor, Australia, to the River Thames in London, UK, and even to a volcano in Auckland, New Zealand. Lin Yifan, 29, had promised to paint a portrait of her grandfather, but had almost forgotten her word until the old man got ill. "I had put off the painting for many years because I believed I would have plenty of time to do it," she said. She spent one evening last week working on a portrait, based on a photo taken on her grandfather's birthday last year. She posted the portrait on Sina Weibo, and called for Web users to take photos with the portrait in different locations and send them to her on May 11.Over the following five days she received about 20,000 photos, most of which were sent by people she had never met. She says that her grandfather, while too weak to view all the photos, has said that he is happy. "Thanks to all these helpers, I have become a celebrity around the world," the old man joked.
Answer: she believed she could do it anytime

Output: Lin Yifan put off painting the portrait mainly because _ .

Input: Consider Input: Article: Many everyday American expressions are based on colors. Red is a hot color. Americans often use it to express heat. They may say they are red hot about something unfair. When they are red hot they are very angry about something. The small hot tasting peppers found in many Mexican foods are called red hots for their color and their fiery taste. Pink is a lighter kind of color. People sometimes say they are in the pink when they are in good health. It probably comes from the fact that many babies are born with a nice pink color that shows that they are in good health. Blue is a cool color. The traditional blues music in the United States is the opposite of red hot music. Blues is slow, sad and soulful. Someone who is blue is very sad. The color green is natural for trees and grass. But it is an unnatural color for humans. A person who has a sick stomach may say he feels a little green. A passenger on a boat who is feeling very sick from high waves may look very green. If a person is green at his job, he may be a newcomer and inexperienced. Sometimes a person may be upset because he does not have something as nice as a friend has, like a new sports car. That person may say he is green with envy. Some people are green with envy because their friend has more dollars. The color black is used often in expressions. People describe a day in which everything goes wrong as a black day. The date of a major tragedy is remembered as a black day.
Answer: depressed
Output: If a person feels blue, he is _ .