问题
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There is always the ____of an earthquake in this region, but so far there has been no sign
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A dirty intercooler on an air compressor will cause _____.A.damage to the un-loader operat
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Education ______ how to survive an earthquake should be a major emphasis for all governmen
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It is important to note that a reading of 4 indicates an earthquake ______ with a reading
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It is during the reign of______that Britain build up an empire "on which the sun never set
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Not all earthquakes are strong enough___________.
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