CPU cannot answer:
After Alex reads the question and the little stop sign at the bottom appears, press [Esc] then count to 15. Click "Resume", the time should be out, and the computer will be able to answer. Note: Do not do this if you know the answer to the question.

Easy win:
Start a new game. Do not answer any of the questions, but listen -- if no one answers, then read the answer. Keep a record of the it under the category and price. After the first session finishes, save the game. Go back into the game and you will have all the answers. This can also be done for Double Jeopardy.