18 a bells was such that not more than two or three persons could be connected without seriously impairing the efficiency of the circuit for speech transmission. [Please select]
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She had been afraid of impairing the luster of her virtuously superior position. [Please select]
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He still used the quiet and restrained coloring of the Sung period and prolonged, without impairing it, the great tradition that a century and a half could not quite efface. [Please select]
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