Read these sentences._____, the people of Philadelphia were not as safe as they believed after the first frost. Additional cases of yellow fever were reported in December.Which transition word best introduces the first sentence?

The first sentence says that people’s sense of safety after the first frost was mistaken, since more yellow fever cases appeared in December. “Unfortunately” signals that this is bad news. “Namely” introduces a specific example, “comparatively” makes a comparison, and “usually” describes what happens in general.

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