[gorilla0]

> free=response questions that are automatically evaluated and can handle fairly complex mathematical expressions - man, was that a lot of work!

Wow, that's excellent. I can imagine that would have been a lot of work.

> People like to believe they can outguess a multiple-choice question by being clever

Personally I think it adds a bit more complexity and toughness if I can't see the answer in advance. But that is purely my individual style and opinion and I have not seen any research either proving or disproving my hypothesis.