One day a rich man took his son on a trip to the country so he could have his son see how poor country people were.

    They stayed one day and one night in the farm-house of {#blank#}1{#/blank#} very poor farm. {#blank#}2{#/blank#} the way back home at the end of the trip the father asked the son, “{#blank#}3{#/blank#} did you think of the trip?”

    The son  {#blank#}4{#/blank#} (reply), “Very nice, Dad.”

    The father then asked, “Did you notice how poor they were?”

    The son said, “Yes, I guess so.”

    The father then added, “What did you learn?”

    To {#blank#}5{#/blank#} question, the son thought for a moment and answered {#blank#}6{#/blank#} (slow), “I learned that we have one dog and they have four. We have a fountain in the garden and they have a small river{#blank#}7{#/blank#} has no end. We have brightly colored {#blank#}8{#/blank#} (lantern) in our garden, while they have the stars. Our garden {#blank#}9{#/blank#} (go) to the edge of our yard, but for their back yard they have the whole horizon.”

    At the son's reply, the rich father was speechless (无语的). His son then said, “Thanks, Dad, for{#blank#}10{#/blank#} (show) me how poor we really are.”

—No, it's so {#blank#}1{#/blank#} that I cannot even get close to it.

    As victor Hugo once said, “{#blank#}1{#/blank#}(laugh) is the sun that drives winter from the human face”, and up to now nobody has been able to do this {#blank#}2{#/blank#}(well) than Charlie Chaplin. He {#blank#}3{#/blank#}(bright) the lives of Americans and British through two world wars and the hard years in between. He made people laugh at a time when they felt depressed, so they could feel more content {#blank#}4{#/blank#} their lives. No one was ever bored watching him—his subtle acting made everything {#blank#}5{#/blank#}(entertain).  As time {#blank#}6{#/blank#}(go) by, he began making films. He grew more and more popular as his charming character, the little tramp, became known throughout the world. He walked around stiffly {#blank#}7{#/blank#}(carry) a walking stick. This character was {#blank#}8{#/blank#} social failure but was loved for his optimism and determination to overcome all {#blank#}9{#/blank#}(difficult). Charlie Chaplin wrote, directed and produced the films he starred in. In 1972 he was given a special Oscar for his outstanding work in films. He is loved and remembered as a great actor {#blank#}10{#/blank#} could inspire people with great confidence.

    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.