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: When we see well, we do not think about our eyes very often. It is only when we cannot see perfectly that we realize how important our eyes are. People who are near-sighted can only see things that are very close to their eyes. Everything else seems blurry (unclear). Many people who do a lot of work, such as writing, reading and sewing become near--sighted. People who are far-sighted _ from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too. Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism . This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts . Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them. Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at an object out of one eye; then look at the same object out of your other eye. You will find the object's relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
Answer: only when we realize how important our eyes are

Output: We should take good care of our eyes _ .

Input: Consider Input: Article: I bought a Paul Smith shirt three months ago. For those who don't know, Paul Smith is an English designer brand. His shirts cost about 1,000 yuan and upwards. I paid 50 yuan for my colorful shirt from a street vendor in Beijing. Of course my shirt was a knockoff, a cheap copy of the brand. After a few washes, little balls formed on the surface of the thin material. Do I care? Not at all. You get what you pay for. I have to admit I hate shopping. _ I have other priorities. In You Are What You Wear, US writer Jennifer Baumgartner says people's clothes tell a story about their personality. She writes: "The clothes you choose to wear provide important information about you as a person: your approximate education level, your income, social status and even your level of self-esteem ." When I started work as an undercover crime reporter, I had to shop for jeans and a hoodie in order to fit in with a rough and ready social group. I bought the hoodie in a charity shop. My daughters were shocked. They thought I looked bad, but I knew my disguise was perfect. Elizabeth L. Cline thinks she knows best when it comes to cheap clothes in her book Overdressed: The Shockingly High Cost of Cheap Fashion. She expresses sadness that clothing has been turned into a good that is thrown away after being used once or twice. She looks down her nose at cheap fashion and longs for the good old days when department stores sold quality clothes at high prices. I don't agree. At least people now can choose what to wear without breaking the bank.
Answer: had something to do with his income

Output: From the text we can infer that the author's disguise _ .

Input: Consider Input: Article: Something that has always interested me about Abraham Lincoln is, not surprisingly, his sense of humor. As far as I can tell, he's the first American President to have one. That's because the term"sense of humor" really wasn't in common usage until the eighteen-sixties and seventies. In the eighteen-forties and fifties, it was called"the sense of the ridiculous," and didn't have the positive connotations that"sense of humor" has today. Back then, what was ridiculous was what invited ridicule . Funniness and cruelty went hand in hand. Of course, they still do a lot of arm-in-arm walking in our day as well. Lincoln's humor was very different because, for one thing, it was actually "humor"as what the word meant in his time. We don't make the distinction between "wit "and "humor"anymore; but in the nineteenth century people did. Wit was unpleasant and offensive while humor was pleasant and sympathetic. It's the difference we note now when we distinguish between "laughing with" and "laughing at". Lincoln was much more about "laughing with" than "laughing at". And when "laughing at, " it was often himself he was teasing. In the famous Lincoln-Douglas debates, when Douglas accused Lincoln of being two-faced, Lincoln replied, referencing his plain looking, "Honestly, if I were two-faced, would I be showing you this one?"And, in a way, Lincoln's face itself tells us much about his sense of humor. You can comb through thousands of photographs of politicians, soldiers, and the like from Lincoln's time and not find a single smile. True, the long exposures required for photographs of that time made smiling difficult. Yet Lincoln alone, as far as I can tell, overcame that difficulty. Interestingly, while having a sense of humor, or at least the appearance of one provided by comedy writers has become a necessary characteristic for an American President in our time, in the nineteenth century, too much humor was considered problem. And that was the case for Lincoln. A journalist covering the Lincoln-Douglas debates commented that "I could not take a real personal liking to the man, owing to an inborn weakness. . .that he was extremely fond of jokes, anecdotes and stories."
Answer: photography technology then was not advanced
Output: We rarely see people from Lincoln's time wear smile in their photos because _ .