Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: Bill Gates, the founder of Microsoft and one of the richest people in the world, is now making efforts to reinvent the toilet. Gates has donated a big part of his wealth to charity. Now his charitable organization, the Bill & Melinda Gates Foundation, is looking for future toilets that can improve the living conditions of millions of people. The flush toilet we use today was invented in 1775. While it works well in getting rid of our waste, it also uses a lot of water and needs a costly sewage system . Besides, it's not necessarily practical for the developing world. In some developing countries, lack of toilets leads to poor hygiene ,and _ could kill people. According to the World Health Organization, 1.5 million children under the age of five die each year because of hygiene problems. Last year, the Gates Foundation gave money to eight universities around the world and asked them to start inventing the toilet of tomorrow: a toilet that uses little or no water is cheap and easy to fix, and is safe and hygienic. At the " Reinvent the Toilet Fair " competition recently held in Seattle, twenty-eight designs were displayed. The winners, from the California Institute of Technology , were awarded a $ 100,000 prize by the Gates Foundation. "We couldn't be happier with the response that we've gotten," Bill Gates said at the event. Many of the new designs would not only greatly improve hygiene in the developing world, but also help change the dependence on traditional flush toilets in developed nations, he said. Options: A Eight. B Eighty. C Eighteen. D Twenty-eight. Answer: D Twenty-eight. Question:
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The answer is:
How many designs were displayed at the "Reinvent the Toilet Fair"?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: What's the strongest part of your body? Your head? Bones? It's your teeth. There is a special thing called enamel in teeth. It is the hardest thing in the human body and keeps bacteria away. However, teeth are hurt easily to problems and disease. September 20 is National Teeth-loving Day in China. Let's pay attention to the health of our teeth. Teeth problems are common around the world. Most children and young adults have tooth decay . A study which come out on China Health Monthly magazine this year showed that 40.74% of a sample of 1,306 Chinese students under age 15 has decayed teeth. Food that is rich in sugar increases the risk of tooth decay. After you eat, bacteria go crazy over the sugar on your teeth. The bacteria turn sugar into acids that eat away at tooth enamel. This causes holes in your teeth. Another common problem is crooked teeth . When your new teeth begin to grow and the old teeth haven't fallen out, there isn't enough space for the new ones. This causes crooked teeth. Don't worry. Here are some ways to keep your teeth healthy. *Brush at least twice a day in the morning and in the evening. *Learn to use dental floss . The floss gets rid of food that's hidden where your toothbrush can't get it. *Visit a dentist. He or she can check if you have any dental problems and help you clean your teeth. *Pay attention to what you eat. It's better to eat lots of fruit and vegetables instead of fries and drink water instead of soda. *Wear braces to make your teeth straight and beautiful. Options: A Bones. B Teeth. C Head. D Bactria. Answer: B Teeth. Question:
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The answer is:
What's the strongest part in the human body according to the passage?

Problem: Given the question: Write a multi-choice question for the following article, with the given choices and answer: Article: How do you like your school? Have you ever written to your headmaster to express your idea? Here are some letters written by students from different schools. Luke, 14, from Jiangsu I will give some suggestions about our school uniform. In our school, we students have to wear uniform every day. But the yellow and green sports kit looks really dark and old. It can't stand for young and lively spirit. We can add some red or orange colors and make a new type of uniform. I hope our headmaster will think about it. Danny, 14, from Zhejiang I have two suggestions for my headmaster. First of all, I think we should have more hobby classes in science , such as plane model making class and computer programming class. It is really boring to study basic subjects all the time. And second, I hope we can have more PE lessons or more time for physical exercise. Lots of students now don't have a strong enough body. Sam, 15, from Shanxi I'd like to say thank you to my headmaster. About one week ago, I got a bad cold after playing basketball. Our headmaster came to me after he knew about it. He took care of me until my parents came. I really want to thank him for that. Helen, 14, from Shandong In the letter I wrote, I want to talk about the possibility of personal classes. Now many middle schools are trying the "personal class" system. Students don't have regular classes. They can choose lessons they want to take. _ And it is also good for exercise. We don't have to stay in one classroom all the time. Options: A students have too few classes every day and they love sports B studying basic subjects only is boring and students are too weak C hobby classes are interesting and students have no PE lessons at all D students want to cancel the basic subjects and they want to have more sports lessons Answer: B studying basic subjects only is boring and students are too weak Question:
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The answer is:
The reasons why Danny gives two suggestions are that _ .