1 . A couple in their ________________ (seventy) living in London, UK can choose to play golf in council-run courses costing from ￡10 each time. (所给词的适当形式填空)
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2 . In his _______ (twenty),he had been very famous for his achievements in education. （所给词的适当形式填空）
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3 . There are________ (billion) of people in the world, who need a lot of resources to survive. (用所给词的适当形式填空)
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4 . They are already in their________ (thirty) without a child. (所给词的适当形式填空)
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5 . They used to be good friends at __________ time. (用适当的词填空)
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6 . He made four _____________ (million) dollars last year. (所给词的适当形式填空)
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