I was nine years old when I learnt to ride a bike. The bike was a birthday present from my uncle. You can imagine how  {#blank#}1{#/blank#}(excite) I was when I saw the bike, and I begged my uncle to teach me how  {#blank#}2{#/blank#}(ride)it right away. However, before I got on the bike, I felt  {#blank#}3{#/blank#}(extreme)nervous and I was afraid that I would fall off and hurt {#blank#}4{#/blank#}(me). My uncle held onto the seat andhelped me to get  {#blank#}5{#/blank#}the bike. While I was riding, he wasrunning along beside me, holding the seat so I would not fall over. I was so {#blank#}6{#/blank#}(grate) to him for his help.

      As I was practicing, I became more and more confident. Then, Iheard my uncle shouting, “You are riding it by yourself now!” I was bothexcited and scared. I was really riding by myself, but  {#blank#}7{#/blank#}if I fell off? Could I use the brakesto stop? As I was wondering about this, my uncle ran after me and got hold ofthe bike. I  {#blank#}8{#/blank#}(slow) down and came to a stop. Myheart was still beating fast when I got off the bike. {#blank#}9{#/blank#} (late) that day, having learnt how to get onthe bike and get off it, I felt like I was walking on air! I am still thankfulto my uncle for teaching me to ride a bike on my {#blank#}10{#/blank#} (nine) birthday.

    That Beijing, together with Zhangjiakou, succeeded in getting the chance to host the 2022 Winter Olympic Games, speeds up the development of Zhangjiakou City. Word came {#blank#}1{#/blank#}the Beijing-Zhangjiakou high-speed railway, {#blank#}2{#/blank#}(locate) in North China, is currently under construction, and {#blank#}3{#/blank#}(expect) to be completed by 2020 in preparation for the cities to host the 2022 Winter Olympics. Starting from Beijing North Railway Station, heading west through the Great Wall three times in the capital's territory, the project is a big challenge, {#blank#}4{#/blank#} designers say the explosions needed to dig the tunnels will not have an impact on the structure. The line has a {#blank#}5{#/blank#}(long) of 174 km as a double tracked passenger dedicated line, with ten stations situated along its route. Having a {#blank#}6{#/blank#}(totally) investment of 31.17 billion yuan ($5 billion), the trip between the two cities will only take 40 minutes, with the train {#blank#}7{#/blank#}(travel) at an average of 250 km/h. According to the plan, the high-speed railway will build two branch lines—one is to Yanqing Station and the other {#blank#}8{#/blank#} Taizicheng of Chongli, {#blank#}9{#/blank#} the Olympic village lies. The full railway, which includes 70-kilometer section through Beijing, will be completed in four and {#blank#}10{#/blank#} half years.

    Cao Yuan, a 22-year-old Chinese doctoral student in physics, was on top of {#blank#}1{#/blank#} most important scientists named by the journal Nature in 2018 for {#blank#}2{#/blank#} (discover) a "magic angle" in graphene (石墨烯).

    Cao's discovery takes a huge step in the decades-long search for superconductors (超导体) in the world. Why was Cao able to make the discovery? His teachers think it is Cao's independent learning ability and interest in doing experiments {#blank#}3{#/blank#} matter. His high school physics teacher said Cao had a strong ability to study on {#blank#}4{#/blank#} (he) own and was brave to challenge teachers and ask difficult questions. "Cao is {#blank#}5{#/blank#} (deep) curious about laboratory equipment," his college teacher told Nature. "Every time I go into Cao's office, it's {#blank#}6{#/blank#} a huge mess, with computers {#blank#}7{#/blank#} (pull) apart and pieces of telescope all over his desk."

    At 14 he {#blank#}8{#/blank#} (admit) into the University of Science and Technology of China's School of the Gifted Young, a special school to cultivate {#blank#}9{#/blank#} (teenager) into world-class talents. But Cao doesn't think himself special and often stresses that he is just an ordinary kid who {#blank#}10{#/blank#} (love) reading about science and doing experiments. "After all, we are all humans, with shortcomings and emotions," he once said.