Article: Why would an animal kill itself? It seems a strange question, and yet it is one that has made some scientists curious for a long time. For there is a kind of animal called lemming , that periodically killed themselves together, and no one knows just why! The small creatures which live in the Scandinavian mountains, feed on a diet of roots and special insects and live in nests they dig underground. When their food supply is large, the lemmings live a normal and undisturbed life. However, when the lemmings' food supply becomes too low to support the population, a _ migration begins. The lemmings leave their nests in groups. Great numbers of them begin to travel across the Scandinavian plains, a journey that may last weeks. The lemmings eat everything in their path, continuing their long march until they reach the sea. The reason for what follows remains unbelievable to naturalists. Upon reaching the coast, the lemmings do not stop but swim by the thousands into the sea. Most stay afloat only a short time before they tire, sink and drown. A common theory for this mass self-killing is that the lemmings do not realize that the ocean is such a huge body of water in their cross-country journey, the animals must cross many smaller bodies of water, such as rivers and small lakes. They may think that the sea is just another such swimmable path to go through. But no final answer has been found to the strange happening. Question: A reason for the lemmings' self-killing might be that they  _  . Yes or no, is the answer "think they can cross the sea"?
No

Article: In most parts of the world, many students help their schools make less pollution. They join "environment clubs ". In an environment club, people work together to make our environment clean. Here are some things students often do. No-garbage   lunches. How much do you throw away after lunch? Environment clubs ask students to bring their lunches in bags that can be used again. Every week they will choose the classes that make the least garbage and report them to the whole school. No-car day. On a no-car day, nobody comes to school in a car. Not the students and not the teachers! Cars give pollution to our air, so remember: walk, jump, bike and run. Use your legs! It's lots of fun.. Turn off the water! Did you know that some toilets can waste twenty to forty cubic meters of water an hour? In a year, that would fill a small river! In environment clubs, students mend those broken toilets. We love our environment. Let's work together to make it clean. Question: Environment clubs ask students   _  . Yes or no, is the answer "to use lunch bags"?
Yes

Article: My mother is taking a tour of the new house via Skype. I leaned the laptop so she can see where she's going,pleased that our Internet connection in Zimbabwe is holding. "This is the living room," I say. Then I tell mydaughter,s;Show Grandma the bed for the mummy and the daddy. " From a continent away, Grandma gave herapproval. Mum had a dollhouse,too. My grandmother,a single mother, did not have enough money to buy my mother areal dollhouse. So Mum made do,laboring over her square cookie tin for years. She stuck patterns on the bright walls : tin cans of jam and bags of flour to make sure the dolls' store was overflowing. My mother passed her love of life in miniature(  )  on to me very early. At age 5,1 made chests of drawers for my dollhouse bedroom from matchboxes glued together. Unlike my mother,l was given some ready-made doll furniture and accessories. My mother encouraged me,always responding to my calI,"Come to see what I've made Lrur IIly  clollhuuse ! " I spent hours writing a book with the unoriginal but certainly accurate title " How To  Make Dolls'  House Furniture". The book was lost in a household move. But the satisfying feeling of filling up blank pages with my own ideas stayed with me,pushing me into a career centered on words. My daughter turned 3 recently, and last month I put a strong empty cardboard box,about the size of a tea tray  ,in Cassia's bedroom. I searched the shops for dollhouse furniture. But an afternoon's searching yielded only a pink plastic toilet and sink. It doesn't matter,l told myself. I showed Cassia how to make plates for her table from coloured buttons. Fascinated, she collected black stones. What my mother gave me was much more than a fascination with tiny things :It was the ability to view things from a new perspective  , to put oneself in another person's shoes , and to solve problems with whatever is at hand. Question: While making her own dollhouse, the writer  _  . Yes or no, is the answer "often showed it off to her mother"?
Yes

Article: One of the main decisions you must make when traveling is deciding where to stay. A good place to stay can often make a holiday. Whether you are looking for a classy hotel or a night under the stars, we can guide you through your different options. Bed and Breakfast An English invention, bed and breakfasts offer exactly what they suggest, a bed for the night and breakfast in the morning. People who hate the anonymity of hotels but want more luxury than a hostel often choose to stay at bed and breakfasts. "B&B's", usually someone's private home, are often found in the countryside. Hostels For those traveling on a tight budget, hostels are the best accommodation option. Informal places usually with a friendly youthful vibe , they offer dormitory beds for rent. Bathrooms are usually down the hall. Remember to check reviews by previous guests online before you book your hostel. Couch Surfing An unusual but interesting option, couch surfing is a growing trend among young internationals. The idea is that you become a member of the online couch-surfing community (www. couchsurfing. com) and then when you travel, look up other members in that country and ask to stay on their couch  . Most hosts will suggest sightseeing trips and take you out in the evening, making it a great way to see things that aren't in your guidebook. And remember, it may be free but don't forget to offer to buy your host a drink or dinner. Camping Sleeping under the stars! For budget travelers staying at camping grounds is the cheapest way to travel. The drawback is that you have to carry a tent with you. Camping grounds can be found across Europe, America and Australia. However, if you intend on camping in busy cities, check first where the nearest campsite is. More often than not, they are on the outskirts, which can mean lengthy bus rides into town when you want to eat or see the sights. Question: The advantage of couch surfing is that    _  . Yes or no, is the answer "you can explore the nightlife there"?

No