Ответ:

If you want to stay healthy, you should exercise regularly and eat a balanced diet.

You had better leave now if you want to avoid the rush hour traffic.

I would rather go to the beach than stay at home all day.

He ought to apologize for what he said to her yesterday; it was really rude.

If you don't want to be late, you should leave earlier than usual.

She would rather spend her weekends reading a good book than going out to parties.