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Space travel
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3. on Mars but / will work / not on the sun. / Robots
Robots will work on Mars but not on the sun.
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2. in space station / will stay / Space tourists / for their holidays.
Space tourists will stay in space station for their holiday.
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1. and make / Engineers / spaceships. / will design
Engineers will design and make spaceships.
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4. Rockets and / solar energy. / will use / other transport
Rockets and other transport will use solar energy.
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