| 1 | He turned abruptly and walked back the way we'd come. | |
| 2 | "How do you know that?" said his aunt, suddenly pricked to the quick with a lively curiosity. | |
| 3 | Federal health officials on Wednesday linked the H1N1 flu epidemic to a sharp rise in the number of severe bacterial infections. | |
| 4 | Almost no one, including sophisticated economists and financiers, realized that the steep increase in housing prices that ended in 2006 was a bubble phenomenon. | |
| 5 | As reported in a National Geographic article, aid groups and doctors are seeing a spike in health problems in coastal areas associated with the spill. |
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