The laptop has a long battery life., , The robot contest takes place every year. , , Venus has a very high temperature., , Andy cleans faster than Eddie., , It will be very cold on Mars., , I think humans will move to another planet in the future., , Do you think a space station will be a good place to live in 2100s?, , Where do you think human will live when Earth is overcrowded?, , Earth has the great gravity to live., .

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