Daily waterings keep shellas plants healthy and she watches closely for early signs of disease

The word "closely" functions as an adverb in the sentence "Daily watering keeps Sheila's plant healthy and she watches closely for early signs of disease" closely (adverb): closely (comparative more closely, superlative most closely)  

Explanation:

obama was told in early july 2004 that he was chosen to deliver the address, and he largely wrote the speech himself, with later edits from the kerry presidential campaign.