In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.

Article: Fahad Azad, an engineer in India, invented a robot named DuctBot.The toy-car sized DuctBot measured 23 centimeters in length, 19 centimeters in width and 9 centimeters in height and weighs just two kilograms. The robot is designed to snake through dark, narrow air conditioning ducts and clean them.A pair of LEDs fitted on the robot light up the dirty scenery, so _ can be captured by a camera. In order to control it more easily, Mr. Azad chooses to fix DuctBot on wheels.The robot can clean off lots of dirt, as well as dead pigeons and insects.Keeping indoor air in good quality and monitoring carbon-dioxide levels in buildings with central air conditioning is a challenge.It is important in some places where clean air can mean a difference between life and death, such as hospitals.Dirty air has a bad influence on people's health. EPSCO, a Dubai-based company which specializes in improving indoor air quality, read about Mr. Azad's invention in a national newspaper after he had won an international robotics competition.EPSCO had cleaning equipment, but it needed someone to get into those ducts to do the dirty, dangerous work.Across India, for example, the task still falls to children.They are small enough to go through those ducts. In 2005, Mr. Azad who was still at university decided to do something about it.Six years later his own company, Robosoft Systems, has Bluestar, EPSCO and the Indian Navy, some leading air condition makers, as partners. Mr. Azad and his ten employees are currently exploring robot designs to examine oil tanks or sewage pipes.Their biggest challenge is to make the robots user-friendly enough.Mr. Azad hopes that the robot could eventually be operated not by engineers but by workers.There will be lots of difficulties they need to overcome in the future.
Answer: It is designed to move like a snake in the ducts.
What can we learn about Ductbot?

Article: December 2 Sharon called about four times today. At least it shows she's trying to explain something to me. I feel a little better. December 3 This morning Sharon said she had only told one person and didn't know why everyone seemed to know. Yes, I am an adopted daughter. But she had promised to keep it a secret for ever! December 5 I wish I had a friend I could really trust all of the time. I thought I found that friend, but I haven't and it's making me miserable ! It's wrong to tell her all about it. She gains my trust, and then loses it. December 7 I have a nice room, beautiful house and everything I've ever wanted. My adoptive parents will give me all the things I've ever dreamed of. Yet all the money in the world can't buy what I want now. I want for Sharon to be my best friend again. December 10 Sharon just called. She said she thought it might help if we spent more time together. She worried that I would switch schools . She is the best friend I've ever had. When I'm with Sharon, I can be myself. I need Sharon's friendship. I need it more than I've ever known. December 16 I just had the most _ two days of my life! This was the best time I've had for a long, long while. Yesterday, we walked five times around the park and today we walked along the river for twenty minutes. We talked so much. Sharon, Sharon, no brick wall between us now.
Answer: Her friendship with Sharon.
What is the author mainly worried about?

Article: In an age dominated by new media and the Internet, there are so many alternative ways of learning.Gone are the days when, if we couldn't make it into a classroom, the only real option was to pick up a book, or when audio materials consisted of bad quality cassettes or sporadic radio and TV programmes.With the appearance of broadband access to the web, we have a whole new learning domain at our fingertips.Sophisticated learning materials in the form of text or high-quality audio are now available at the touch of a button, and tests and assignments can be submitted and marked online.Questions and learning, studying away from the classroom has never seemed easier.Yet many teachers would argue that face-to-face contact between teachers and students is an essential part of the language learning experience.Enter the concept of blended learning, an approach to education which seeks to combine the best of new technology and actual human contact. Advocates of blended learning argue that an approach to study which combines the benefits of new technology with the best aspects of face-to-face (often abbreviated to F2F) teaching, will achieve better results.For example, there are some aspects of study, like practical sessions, dealing with more subjective questions, or meeting the needs of an individual student, which require face-to-face human interaction, whereas the more mechanical aspects of learning, such as answers to clear-cut questions, can be managed simply and effectively in a remote environment using new technology. Blended learning approaches have proven especially appropriate in language learning.For example, in an ELT (English Language Teaching ) environment, a simple scenario might be a classroom session where a teacher asks a group of students to use a wiki to create a text. Students then go away and compose and edit the text remotely.During the next F2F session, the teacher express his opinion about their work.
Answer: Blended learning is an effective learning approach.
What is the main idea of this passage?