1 . Scientists have advanced many theories about why human beings cry tears, ________________ (都没有得到证实). (根据汉语提示完成句子)
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2 . The books on the desk, of ________ the covers are shiny, are prizes for us.
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3 . He gave me his advice, some of ______ was very useful. (用适当的词填空)
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2020高三·全国·专题练习
4 . He wrote many children’s books, nearly half of ____ were published in the 1990s.
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5 . The science of medicine, in_______ progress has been very rapid, is perhaps the most important of all the science.
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6 . Mr Smith, from
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7 . An electronic dictionary has lots of advantages. The biggest is its convenience. (用非限制性定语从句改写)
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8 . In our school there are 50 students, half of __________ wear glasses. （用适当的词填空）
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9 . In 2018, more than 760 million people in China participated in the sharing economy, about 75 million were service providers.
| A．which | B．when | C．of which | D．as |
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10 . Among the performers in the circus were some boys, ___________the youngest was only seven.
| A．of whom | B．which | C．that | D．of those |
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