A recent study suggests that students who bring water into exams may improve their grades by 10 percent．

    Scientists then {#blank#}1{#/blank#} (比较) their exam results with their normal schoolwork grades．They found that all those {#blank#}2{#/blank#} had brought drinks with them got better grades．

    Scientists also considered the students 'schoolwork and {#blank#}3{#/blank#} (预计)their grades．This was to make sure that the reason was not simply that smarter students were more {#blank#}4{#/blank#} (有可能)to bring drinks with them．

    {#blank#}5{#/blank#} is unclear why drinking water improves exam results．But scientists say having enough water in our b{#blank#}6{#/blank#} and not feeling thirsty could have a helpful effect {#blank#}7{#/blank#} our brains．Drinking water may also cut d{#blank#}8{#/blank#} on anxiety ,which affects exam performances．

    So next time， w{#blank#}9{#/blank#} you are going to have a big exam，try bringing a bottle of water with you．Who knows—it may help you p{#blank#}10{#/blank#} the exam!

    Starting in 1972, the National Park Service established a policy for forest fires called Natural Bum. It was true {#blank#}1{#/blank#} some forest fires, such as those which were caused by lightning were necessary for forests{#blank#}2{#/blank#} (keep) balanced ecosystems, so the fire should be allowed to burn{#blank#}3{#/blank#} , a big fire in Yellowstone National Park in 1988 caused this policy to be abandoned (放弃) since the fire was initially allowed to burn yet soon out of control. As a result, the fire of 1988 destroyed much of Yellowstone, which is America's {#blank#}4{#/blank#}(old) and most beloved national park. Massive areas of plants were destroyed, and large empty spaces and acres of burned and blackened trees greeted {#blank#}5{#/blank#} (visit). The rivers and streams were choked with ash, and the ecosystem of the park was changed {#blank#}6{#/blank#} repair.

    In addition, great numbers of animals{#blank#}7{#/blank#} (kill) by the fires that burned out of control. The fires were driven by high winds{#blank#}8{#/blank#} (move) as many as ten miles a day. Many small animals died in the flames. The fires' rapid advances {#blank#}9{#/blank#} (give) the wildlife little chance to escape. Even today, few of these small forest animals have returned to live in the park. In the years immediately following the fires, the numbers of visitors declined{#blank#}10{#/blank#} (rapid).

    Finishing their shopping at the mall, a couple discovered that their new car {#blank#}1{#/blank#}（steal）. They filed a report at the police station and a detective drove them back to the parking lot to look {#blank#}2{#/blank#} evidence.  To their{#blank#}3{#/blank#}（amaze）, the car had been returned{#blank#}4{#/blank#} there was a note in it that said: “I apologize for {#blank#}5{#/blank#} (take) your car. My wife was having a baby and I had to rush her to the hospital. Please forget the inconvenience. There are two tickets for tonight's Mania Twain concert.”  Their{#blank#}6{#/blank#}(faithful) in humanity restored. The couple attended{#blank#}7{#/blank#}concert. But when they returned home, they{#blank#}8{#/blank#}(immediate) found{#blank#}9{#/blank#} their house had been ransacked （洗劫）. On the bathroom mirror was{#blank#}10{#/blank#}note: “I have to put my kid through college somehow, don't I?”

    Since July 2019, China's online food-delivery platform Eleme {#blank#}1{#/blank#} (carry) out a new service of picking up garbage from its users in Shanghai.

    The service comes after {#blank#}2{#/blank#} recently-released regulation on waste management in Shanghai. Individuals {#blank#}3{#/blank#} throw away their garbage without being sorted out can be fined up to 200 yuan, while companies and {#blank#}4{#/blank#} (organize) can face fines up to 50,000 yuan.

    The trash takeaway service requires residents to sort {#blank#}5{#/blank#} (they) own garbage before it {#blank#}6{#/blank#} (pick) up by workers from Eleme, who will ensure the waste is disposed of in the correct garbage bins.

    It's obvious that this service is {#blank#}7{#/blank#} (convenience) to the old, especially to the disabled customers. {#blank#}8{#/blank#}, many netizens on Sina Weibo don't think Eleme is providing a wonderful service, saying it just wants {#blank#}9{#/blank#} (make) money. They think 12 yuan for an order is too much. Besides, many more people doubt if these collectors will wash their hands after dealing {#blank#}10{#/blank#} the trash.

    Swedish businessman Nile Bergqvist is delighted with his new hotel, the world's first igloo (冰屋) hotel.

    {#blank#}1{#/blank#} (build) in a small town, it has been attracting lots of visitors, but soon the fun will be over. In two weeks' time Bergqvist's ice creation {#blank#}2{#/blank#} (be) nothing more than a pool of water. "We don't see it as a big problem," he says. "We just look forward to replacing {#blank#}3{#/blank#}.

    Bergqvist built his first igloo in 1991 for an art exhibition. It was {#blank#}4{#/blank#} successful that he designed the present one, {#blank#}5{#/blank#} measures roughly 200 square meters. Six workmen spent more than eight weeks {#blank#}6{#/blank#} (pile) 1, 000 tons of snow onto a wooden base. When the snow froze, the base {#blank#}7{#/blank#} (remove).

    After their stay, all visitors receive a survival certificate recording their success. Without{#blank#}8{#/blank#} (window) and places to hang clothes, it may seem more like a survival test than a relaxing hotel break with temperatures below 0℃. "It's great fun," Bergqvist explains. "As well as a good start in survival training."

    The {#blank#}9{#/blank#} (popular) of the igloo is beyond doubt. It is now attracting tourists {#blank#}10{#/blank#} all over the world. At least 800 people have stayed at the igloo this season even though there are only ten rooms.