Here are the completed sentences with "should" or "shouldn't":

1. You look tired. You **should** go to bed early.
2. She is gaining weight fast. She **should** eat less.
3. It’s a very dangerous area. You **shouldn’t** go there.
4. If you drank, you **shouldn't** drive your car.
5. The road is bumpy. You **should** drive carefully.
6. Students **should** listen to their teacher.
7. He **shouldn't** smoke a lot because it’s not good for his health.
8. You **shouldn't** drive on the pavement. It’s for pedestrians.
9. The film is very interesting. You **should** watch it.
10. Her mother is in hospital. She **should** visit her.