Sure! Here are the completed sentences based on the instructions:

**Exercise 8:**
1. Photographers **have to** take photos.
2. Teachers **have to** wear a uniform.
3. Bus drivers **have to** work with animals.
4. John **doesn't have to** wash the floor.
5. John **has to** remember to be polite.
6. John **has to** close the shop at 5:30.

**Exercise 9:**
1. do I **have to** open the café?
2. You **have to** open the café at 9:30 a.m.
3. You **don't have to** clean the windows.
4. No, you **don't have to**.
5. You **don't have to** answer the phone.
6. No, you **don't have to**.
7. You **don't have to** make cakes.

If you need any more help, feel free to ask!