Every writer’s got some sort of phrase they repeat over and over in their writing.  In fact, everyone has something they say often.  If you know someone well, chances are you could tell me exactly what they would say in a certain situation.  These things can be endearing between two persons and for a reader with their favorite author, but you, as a writer, should keep a sharp eye on it.  It’s one of those things that can easily annoy a reader and a publisher just because it’s something they notice.  John Flanagan tends to use the word ‘philosophically’ a dozen times in a book.  I have caught myself using the phrase ‘she had never been so _____ in her entire life’ over and over again.  When I read my sister’s work a couple years ago, I noticed she had the word ‘she started’ on every other page.  There are just certain words you think of first when you’re writing.  Just remember to try to vary your words a little to help give it more flavor and just to mix things up.