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Jane is a wonderful singer. Her mother tells me that she ______  professionally since she was four. 

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They try to imitate the wing and shape of animals in nature to produce parts of vehicles

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We ______ in Hanoi for a long time.

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The Tower Infinity in South Korea is supposed to be the world’s first skyscraper that, for a few hours a day, _______ an unobstructed view of the sky behind it.

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The general opinion was that the suits were too big and taking up too much space in the cramped confines of the aircraft.

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I can’t believe that you ______all the three exercises. You just started five minutes ago.

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In 1880 Alexander Graham Bell was granted a               on an apparatus for signaling and communicating called a Photophone.