Wstaw odpowiednie formy has to/have to

1. He __________________ (not looking after) my dog.
2. My parents. _____________________ (work) in hospital.
3. Our friends. ______________________ (be polited) to customers.
4. The teachers. _______________ (not fix) leaks.
5. Has ________ doctors _________________ (look after) patiens? Yes ________.
6. ____ my brother _______________ the bed? No ________________.​