Maybe you could pre-read a book or 2 so that you
have read the book he's using. But, I'd still be careful not to answer the questions for him.

The questions in DITHOR are trickier because they're not "one right answer" questions. They do require thinking. If my son seems a little stumped or seems to need help with one, I'll ask him a question about it. Like if he's supposed to be tellng me how his book characters show responsiblity -you could say, "________ is the main character in your book, right? So, have you read about any chores that ________'s mom and dad have him do? Does _________ have a job?" That usually gets him going.
Maybe he's just not comfortable with questions that can have more than one answer. I know that so would have been me in elementary school. If your child tends to like to do things "right" or not try things they're not sure they're good at, maybe they're a little perfectionistic. I'd just make sure that you let him know that there could be SEVERAL right answers to this question. Talk through them 1st even though they're in the student book maybe. You don't have to draw the discussion way out, but if you ask him what is the 1st answer/example that comes to mind, maybe you can get him to share just a bit of the story and then encourage him by building on it a little or talking about how that's a great example of what you're looking for. I talk this way with my oldest because I like to hear more of the story than I listen to aloud (and he happens to love to share it).
We've really loved DITHOR here. I love the way that it teaches my son to read with discernment by comparing the actions of the book characters to what scripture teaches through the lives of Bible characters and godly character qualities. This really spills over into all that we take into our minds - playing with friends, TV, movies. And, I can see it giving him a love for good literature. It's worth working on, and I'm sure you'll get it!

Kathleen