Itzhak Perlman, a famous violinist, came on stage to give a concert. He was stricken with polio（小儿麻痹症）as a child, so getting on stage is no small {#blank#}1{#/blank#} (achieve).

    The audience sat quietly while he made his way across the stage {#blank#}2{#/blank#} his chair and began his play. But this time,{#blank#}3{#/blank#} went wrong. Just as he finished the first part, one of the strings on his violin {#blank#}4{#/blank#}(break). We thought that he would have to stop the concert. But he didn't.{#blank#}5{#/blank#}, he waited a moment, closed his eyes and then signaled the conductor to begin again.

    {#blank#}6{#/blank#} (power) and pure, his performance attracted all the attention.

    Of course, anyone believes {#blank#}7{#/blank#} impossible to play a harmonious work with just three strings. I know that, and you know that, but that night Itzhak Perlman refused {#blank#}8{#/blank#} (know) that.

    When he finished, people rose and cheered.

{#blank#}9{#/blank#} (smile), he wiped the sweat and said, “You know, sometimes it is the artist's task to find out how much music you can still make with{#blank#}10{#/blank#} you have left.”

    Chinese researchers have planned to build an airport in Antarctica in November. The Chinese {#blank#}1{#/blank#} (be) not very used to flying to the southernmost continent, because the country s first polar plane, the Snow Eagle 601, {#blank#}2{#/blank#} (put) into use only three years ago.

    Before the Snow Eagle 601, Chinese researchers traveled to the ice-covered land by ship, which took significantly {#blank#}3{#/blank#} (long) than flying. There are currently more than 20 airports in Antarctica, but none of them belong to China. The Snow Eagle 601 has to rely on Russian airports {#blank#}4{#/blank#} (take) off and land. That's {#blank#}5{#/blank#} the Chinese researchers decided to build their own. Building an airport in Antarctica is very different from building one elsewhere. The continent is covered by a {#blank#}6{#/blank#} (constant) moving layer of ice, so the builders must find somewhere that moves at the slowest possible pace and in a {#blank#}7{#/blank#} (fix) direction.

    The builders managed to find a spot back in early 2017 following {#blank#}8{#/blank#} tough measuring process that took place in the storm-like polar winds. The next problem is the snow. The soft nature of snow makes {#blank#}9{#/blank#} a bad material for a runway. So the builders must use road roller-like {#blank#}10{#/blank#} (machine) to press the snow, which can be very time-consuming in extreme coldness.