Verified answer

1. I had my car repaired last week.  
2. I will have my flat painted next week.
3. John stopped going to the gym.
4. Little Tommy is not tall enough to reach the light switch.
5. It's worth visiting the New York Metropolitan Museum.
6. Louise must have had a wonderful holiday.
7. I must have left my wallet at home.
8. I shouldn't have bought a motorbike.