I have to practise the piano every day. ONLY ---> If ____________ to practise the piano every day!

1. I have to practise the piano every day.               ONLY
-> If ____________ to practise the piano every day!
2. I don't know how to repair the car.                      KNEW
-> If ______________ to repair the car!
3. It rains here every day.                                        RAIN
-> If only __________________________
4. If you change your mind you'd be welcome to join our staff.                          CHANGE
-> Were you __________________________________
5. If he fials the final exam, he won't be able to graduate.                             BE
-> Unless ____________________________________________