For since exercises perfect english grammar - Preposition exercises

Choose the correct preposition to complete the sentences.
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Keep in mind the grammar tests are generated automatically and sentences for them are taken from corpora. If you notice any mistake or inappropriate content, please, let us know.
What new areas of study have emerged _____ science and technology studies in recent decades?
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Piracy attacks have occurred _____ Operation Ocean Shield has ended.
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Andreas Kloppmann has worked _____ years to achieve his good name.
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The country had not dominated _____ a decade.
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Then human nature has not changed _____ the days of Homo erectus.
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Scientists have wondered _____ decades what changes in the brain might underlie these enhanced auditory abilities.
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I instantly wrote to Geneva ; nearly two months have elapsed _____ the departure of my letter.
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He of course accomplishes deeds which no man has worked _____ Moses and the other prophets.
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Demonstrators have rallied _____ weeks demanding his resignation.
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Long time has passed _____ the West discovered Japanese art.
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