Important: "Bot checks" ahead

Heads up: now that you've been playing a while, you are no longer exempt from 'bot checks.' CB uses bot checks to keep would-be cheaters from automating their play. Wherever you can use BA, you will sometimes get a bot check and be prompted to type the top word. Three examples are on the right. With a little practice, this is easy for humans, but it's very difficult to write a program to do it for you.

You may want to check out bartjan's trainer for some practice. If you're too young to remember cursive writing, you should probably read this guide, too.