Read each sentence from a short report about Hurricane Katrina. Each sentence contains one mistake. Rewrite the whole sentence correctly.
Do not forget the punctuation. It is a good idea to revise grammar tenses before you proceed: Reading Time Through Grammar: Present Tenses in Context, Reading Time Through Grammar: Narrative Tenses in Context

1. At first, some residents were believing that the hurricane would weaken before landfall.
2. At that moment, volunteers rescued people from rooftops as helicopters were flying over the flooded city.
3. During the emergency meeting, city officials had a heated discussion about why the levee system had failed.
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