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: When I was a child I never said, "When I grow up, I want to be a CEO," but here I am.When I look back on my career, I realize the road to becoming a CEO isn't a straight, clearly clarified path.In fact, no two paths are the same.But whether you want to be a boss one day or not, there's a lot to learn from how leaders rise to the top of successful companies.     As this series of stories shows, the paths to becoming a CEO may vary, but the people in that position share the qualities of commitment, work ethic and a strong desire for building something new.And every CEO take risks along the way--putting your life savings on the line to start a software company or leaving a big business to be one of the first employees at a startup.     I grew up in Minnesota, and learned how to be an entrepreneur from my father, who has run a small business for almost 30 years.I went to Georgetown University and tried a lot of business activities in college with varying degrees of success.And I always had a dream job pattern: to walk to work, work for myself and build something for consumers.     I'm only 29, so it's been a quick ride to CEO.Out of college, I worked for AOL as a product manager, then moved to Revolution Health and ran the consumer product team.In mid-2007 I left Revolution Health and started LivingSocial with several other colleagues, where I became a CEO.     Career advice: Don't figure out where you want to work, or even what industry you'd like to work at.Figure out what makes you do so.What gives you a really big rush? Answer why you like things, not what you like doing...and then apply it to your work life.Also, just because you're graduating, don't stop learning.Read more books than you did in college.If you do, and they're not, you're really well-positioned to succeed in whatever you do. 
 Answer: save every possible penny

A: According to the author, successful CEOs should   _  .
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Q: Article: At night, bats fly through the air, catching hundreds of insects and other small animals. But during the day, they hardly move at all. Instead, bats pass the time hanging upside down from a secret spot. There are a couple of reasons why bats rest this way. First of all, it puts them in a position for takeoff. Unlike birds, bats can't fly into the air from the ground. Their wings don't produce enough lift to take off from a dead stop, and their hind legs are so small and underdeveloped that they can't run to build up the necessary takeoff speed. Instead, they use their front claws to climb to a high spot, and then fall into flight. During the hours when most enemies are active, bats gather where few animals would think to look and most can't reach. This allows them to disappear from the world until night comes again. There's also little competition for these resting spots, as other flying animals don't have the ability to hang upside down. Bats have a unique physiological adaptation that lets them hang around this way without using any energy. For you to hold your fist around an object tight, you contract  several muscles in your arm, which are connected to your fingers by tendons ;as one muscle contracts, it pulls a tendon, which pulls one of your fingers closed. A bat's talons  close in the same way, except that their tendons are connected only to the upper body, not to a muscle. To hang upside down, a bat pulls its claws open with other muscles. To get the talons to take hold of the surface, the bat simply lets its body relax. The weight of the upper body pulls down on the tendons connected to the talons, causing them to hold tight. Therefore, the bat doesn't have to do anything to hang upside down. 
 Answer: they can't start to fly from the ground directly

A: Bats hang upside down because  _  .
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Q: Article: No one knows why we sleep, but it's certain that we need to. People who are prevented from sleeping begin to suffer obvious effects after a few days--they think less clearly, and they fall asleep during the working hours; some may have hallucinations . There are no rules about sleep. Generally speaking, grown-ups sleep about 7 and a half hours each night and probably more than 60 per cent get between seven and eight hours. But perhaps eight per cent are quite happy with 5 hours or less, and four per cent or so find that they want ten hours or more. If you feel all right, you're probably getting enough sleep. The important thing is not to worry how much other people get--their needs may be different. Exercise doesn't seem to increase the need for sleep--office workers, for example, sleep for about as long as people doing physically active work. Children sleep more than grown-ups--perhaps 14 to 18 hours soon after birth, going down to grown-up levels by early teenage. Sleep patterns also tend  to be different in the elderly, who may sleep less at night than they did when younger, find sleep getting more broken, and often make it a rule to sleep during the daytime. 
 Answer: they are certain to be kept from going to bed

A:
According to the passage, some people are unable to think clearly because   _   .
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