You can tell Pages to prevent single lines from appearing at the top and bottom of pages. You can also keep entire paragraphs together on a page, or with other paragraphs. You can even force a paragraph to start on a new page. These options can all be found in the Text Inspector under the More category.
Hi Gary.
I don't use Pages that often but I decided to buy your 'My Pages' book on my iPad, as a way of supporting you and all you do for us. It's great to be able to have your book open on the iPad whilst working on a Pages document on my Mac. The Widow and Orphans issue has always annoyed me, I had no idea there was a way round the problem. Your instructions are very easy to follow as always - thanks again. Al