Choose the correct verb forms to complete the Time Traveler's Safety Guide.

As a time traveler, you had better blend in with the locals, or you will permanently alter history! Furthermore, the Agency would rather you didn't talk to your past self under any circumstances.

As a time traveler, you had better blend in with the locals, or you will permanently alter history!

"Had better" is used for strong warnings and is always followed by the bare infinitive (the base verb without "to").

Furthermore, the Agency would rather you didn't talk to your past self under any circumstances.

When "would rather" is followed by a different subject (the Agency would rather you...), we use the past tense to express the preference. The correct negative past form here is "didn't".