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1 . Space travel will be a common thing in the future. (改为一般疑问句)
_______________ space travel _______________ a common thing in the future?
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2 . The invention of smart phones changed the world in many ways. (改为一般疑问句)
______ the invention of smart phones change the world in many ways?
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3 . She put the keys on the table yesterday.(改为一般疑问句 )
______ she ______ the keys on the table yesterday?
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