The Roman alphabet is a Greek invention, ______ is the marathon, a long distance race created in honour of a Greek soldier.
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Jim passed the driving test，________ surprised everybody in the office.
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this
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____ can be seen in the chart right here, the air pollution level in the city has been increasing over the last months.
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The result of the experiment was every good, ______ we hadn’t expect.
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when
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which
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