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7 Scientists think that (there has been) life on earth for (more than millions of) years
8 Have scientists ever sent spaceships to travel (into the deep space)?
9 (How long) does it (take to get) Nanjing by train from Beijing?
10 Have you (seen) a (spaceship) without people?
8 Have scientists ever sent spaceships to travel (into the deep space)?
9 (How long) does it (take to get) Nanjing by train from Beijing?
10 Have you (seen) a (spaceship) without people?
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