Had better exercises

Had better exercises. Choose the right expressions: had better or had better not to complete the following sentences in English.
1. You give up smoking. It’s bad for you.
2. Tell James he work so hard. He is overdoing it.
3. You get some sleep. You look tired out.
4. You say that to Chris. He’ll be angry with you.
5. You try to lift that by yourself. It’s very heavy.
6. You eat a lot of sweets.
7. You go to the dentist’s regularly.
8. You eat between meals if you want to lose weight.
9. You clean your teeth at least twice a day.
10. You drive carefully on a busy road.