10. There are seven ways a baseball player can legally reach first base without getting a hit. Taking a base on balls (a walk) is one way. Name the other six.

Batter hit by a pitch; passed ball; catcher interference; catcher drops third strike; fielder's choice; and being designated as a pinch runner.

Sorry but you have an error here. You list passed ball as means for a runner to advance to first base, but that is not correct unless it is a dropped third strike (which you already listed) the other way a player can advance to first without a hit is on an error.