Given that that's something like half of our lexicon, you're going to have a heck of a time reading if you can't process any of them, but okay, let's look just

Given that that's something like half of our lexicon, you're going to have a heck of a time reading if you can't process any of them, but okay, let's look just at words that come from Old English: food, good rough, dough two, to, too