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Lastly, I swept the floor.
Lastly, I finished my dinner.
Lastly, she hid under the box waiting for her prey to come forward.
Lastly, the crook stole all of the jewelry in Skoppyville.
Lastly, he made up his bed.
I believe lastly is an adjective...
Lastly, they repaired the computer.
No. Lastly is an adverb. It cannot be used as a preposition.
Lastly, I would like to thank you for listening to my speech.