Complete the friend's polite but firm boundary about their new vehicle.

I know you're a great driver, but I'd rather you ___ my new car to the monster truck rally.

The correct answer is didn't take.

When expressing a preference about someone else's actions in the present or future, we use "would rather" + subject + past simple tense. Even though we are talking about the future, we use the unreal past form ("didn't take").