Choose the right comparative form.
1. Nick is (happier, the happiest) bot that I know.
2. Of the six cars, I like the silver one (better, best).
3. Jane`s notebook is (cheaper, cheapest) that mine.
4. This is (more delicios, the most delicios) cheese-cake I have ever had.
5. This bookcase is (more beatiful, the most beatiful) than that one.