some students of Beijing Sunshine Secondary School are wondering whether it's______(safety)to live on Mars than on Earth

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some students of Beijing Sunshine Secondary School are wondering whether it's______(safety)to live on Mars than on Earth
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some students of Beijing Sunshine Secondary School are wondering whether it's______(safety)to live on Mars than on Earth
some students of Beijing Sunshine Secondary School are wondering whether it's______(safety)to live on Mars than on Earth

some students of Beijing Sunshine Secondary School are wondering whether it's______(safety)to live on Mars than on Earth
safe