The site isn't always out to get you
I've actually noticed sometimes a stand-alone letter will be an A or I, making the choice easier. (Unless it's an Alexander Pope quote, in which case all bets are off.) Same with the one after an apostrophe being an S or T. The awkward letters like Q, X, and Z do seem to pop up a lot, though.
Slotted spoons don't hold much soup. - Stephen Sondheim