Can you pass this 1970s quiz?
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Which spacecraft was the first to circle another planet?
Mars 5 Mariner 9 Apollo 2 Mariner 1
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Imagine that you and your brother have the same amount of pears. How many of them should he take from you to have 10 more pears than you have?
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Staying apart from others when you have been exposed to COVID-19 is called: