Ответ:

  1. If you promise to clean your room, I'll take you to the funfair.
  2. I won't be able to afford a brand new car unless I get a loan from the bank.
  3. If you decide to study Medicine, you'll have to work really hard.
  4. If we win the lottery, we will travel around the world.
  5. I'll never talk to you again unless you tell me the truth.