It is not a secret {#blank#}1{#/blank#} trees are vital to our life. They provide us with food, wood and most {#blank#}2{#/blank#} (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

    The discovery {#blank#}3{#/blank#} (make) by a team {#blank#}4{#/blank#} (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students {#blank#}5{#/blank#} were seeking a natural water filter(过滤)—one that would help communities in developing countries that do not have {#blank#}6{#/blank#} (accessible) to modern water filter systems.

    The {#blank#}7{#/blank#} (research), led by Professor Rohit Karnik, decided to turn{#blank#}8{#/blank#} trees for help, because they could allow liquid to flow through, while blocking out air bubbles.

    They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water containing red dye particles of different sizes through. To their {#blank#}9{#/blank#} (amaze), they found that it was effective in trapping all the particles. Greatly {#blank#}10{#/blank#} (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

    Born into {#blank#}1{#/blank#} poor family in Gaomi, Shandong Province on February 17, 1955, Mo Yan,{#blank#}2{#/blank#}original name is Guan Moye, threw himself into reading and calligraphy{#blank#}3{#/blank#}(enthusiastic) in his early years. Not only did he have a strong sense of humor,{#blank#}4{#/blank#}he was intelligent and patient. With his attention {#blank#}5{#/blank#} (fix) on literature, Mo Yan went on further education and received a Master's Degree in arts from Beijing University five years later after graduating from the PLA Academy of Arts in 1986. What happened next was{#blank#}6{#/blank#}he won China's {#blank#}7{#/blank#} (high) literary prize — Mao Dun Literature Prize by his book Frog in 2011. To all Chinese's{#blank#}8{#/blank#}(amaze), he became the first Chinese writer to be awarded the Nobel Prize in Literature in 2012, which will certainly make great contributions to development of Chinese literature. Since then, he {#blank#}9{#/blank#}(consider) as the best Chinese writer in modern China. Although he is famous, he is still as common as an old shoe and he doesn't keep his readers{#blank#}10{#/blank#}a distance.

    My program is a course in automotive repair. We teach people from the age of 16 through adults. We're {#blank#}1{#/blank#} (locate)on a high school campus. It's vocational,{#blank#}2{#/blank#} means that we train people specific skills that they could use in a job.

    I like classes like this {#blank#}3{#/blank#}it's {#blank#}4{#/blank#}(much)of the real world than it is sitting there reading a textbook, not {#blank#}5{#/blank#}(know)what you are going to be using it for.

    Today's a work day, so {#blank#}6{#/blank#}I go back into the shop, I have all of my students {#blank#}7{#/blank#}(work)on a project. First, Jack is going to get the air tools out and jack up a car, he's going to take a tyre off that car, with the air impact. Every student that comes onto my program is an individual. All of them think that they're going to be able to fix their own car. They all have {#blank#}8{#/blank#}as a goal that they are going to get out of the program.{#blank#}9{#/blank#} then, as part of my introduction to the class I'll let them know some of the other things that they'll all get,{#blank#}10{#/blank#} include：consumer understanding of how the car works.

    Chinese President Xi Jinping has praised a group of middle school students for their efforts in satellite design. He said he was pleased with their curiosity and bravery in {#blank#}1{#/blank#} (science) exploration. The president also wished the teachers and students in Bayi School {#blank#}2{#/blank#} happy new year.

    Xi made the praise in a letter {#blank#}3{#/blank#} (write) to the students in Beijing's Bayi School on Saturday. A small satellite designed and developed by them {#blank#}4{#/blank#} (send) into space last Wednesday at Taiyuan Satellite Launch (发射) Center {#blank#}5{#/blank#} it was designed to operate in orbit (轨道) for 180 days.

    Three months ago, Xi returned to his high school, to visit a laboratory and talk to teachers and students {#blank#}6{#/blank#} were designing the small satellite. The president said he was {#blank#}7{#/blank#} (extreme) glad to know that the satellite designed by the students would be launched and called on them to become {#blank#}8{#/blank#} (build) of the country. Xi warmly encouraged the students {#blank#}9{#/blank#} (study) science and contribute to the development of China. He hoped that the students would keep hungry for knowledge and develop {#blank#}10{#/blank#} (they) national spirit.