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1、 The development of smart phones has changed the way people communicate. （technology）
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2、 My father often says that is changing the world every day.（technology）
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3、 Many people believe that the are the future of our country. （young）
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4、 These are encouraged to take part in community service every summer. （young）
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5、 Taking exercise every day can make you look than your real age.（young）
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6、 Painting and writing are good ways to develop a mind. （create）
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7、 We need more to make our school activities more interesting. （create）
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8、 We should respect the and never copy their works without permission. （create）
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9、 Modern science a lot of convenience for our daily life.（create）
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10、 There is a (possible) that we will have a school trip next week.
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11、 We (cycle) along the street at 7 o' clock yesterday evening.
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12、(definite), we can win the English contest if we keep practicing.
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13、 Don't forget to carry outdoor (equip) when climbing the mountain.
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14、 We will take a(fly) to Qingdao tomorrow morning.
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15、 We are determined (face) all difficulties in the land exploration bravely.
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16、 Only five players (select) for the school basketball team every year.
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17、 It's impossible (make) great progress without hard work.
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18、 Good skills are the key to (survive) in the wild forest.
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19、 Too many (break) satellites float in the universe, and they are a big problem for space travel.
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20、如果天气晴朗，我们就能看到飞机在夜空中缓缓移动。
If the weather is fine, we can watch a plane the night sky slowly.