Do not leave a dangling line: There must be at least two lines of a paragraph at the bottom or top of a page; in paragraph formatting, this is called widow/orphan control (click on Format > Paragraph > Line and Page Breaks > Pagination>widow/orphan).
If you use a different version of Word, go to Help and type in widow/orphan control for instructions.
One hint: Be certain to do “select all” and set widow/orphan control for pages 1 through references. Do not set this for your table of contents.