You might try explaining that you aren't going to DO it for him, just help explain the concept (which with logic assignments are often very different things). For example you could explain that this page is looking for correlations like Big to Small, but not give him the answer of elephant to mouse. Explain that it's not that you are doing any figuring out FOR him, just making sure he understands he concept to help prevent him getting frustrated with it. Not only that you'll ONLY help explain the ones that he has problems with. Hopefully that will work for him.
That's only if he is bothered by it of course!
