The sentence fragment present in those sentences is...
Regina and her younger sisters.
Tom placed the book on the shelf, it sat there for a week.
Answer:
<h3>early 15c., "uninterrupted connection of parts in space or time," from Old French continuité, from Latin continuitatem (nominative continuitas) "a connected series," from continuus "joining, connecting with something; following one after another," from continere (intransitive) "to be uninterrupted," literally "to hang together" </h3>
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