Do you home in on something or hone in on something?

Do you shimmy up a pole or shinny up a pole?

Which is it-- that he lit the candles or lighted the candles?

Was he reading the Koran or the Quran?

Does this barrage of questions leave you feeling nauseous or nauseated?

Are the headlines frivolous or frivilous?

Is the atmosphere rarefied or rarified?

In newspaper style, is the court decision known as Roe vs. Wade or Roe v. Wade?

Did she rack her brain or wrack her brain?

She has worked so hard. She's a real (trooper, trouper).