When in doubt, try for the cognate. It's usually a winning strategy. And use the opportunity as a challenge -- try your best to imagine how it could conceivably be spelled in French. And heck, since these exercises are not timed, you can then type your guesses into Google Translate and see whether something makes sense. You'll learn more from doing that than if they just fed it to you. I don't learn words they give me just once unless they're cognates anyway.