I think the answers get longer and longer as you get further into the book. I was worried too when I submitted my first assignment. I have only completed through the first test. No novels yet!
BTW there are A LOT of study guide questions for the first exam. I hand wrote those and it took me 15 pages to answer all of them! I found the test to be easy after studying the study guide and homework. It only took me about 20 minutes, but I didn't review my test or contemplate answers. And the tests are multiple choice with some true/false.