Writing the correct form of the adjective in the space provided would be:
1. High School Musical is a bad movie. It's bad) . Scary Movie. It is the worst movie I ever watched.
2. A diamond is hard. It is harder than mica. It is the hardest mineral of all.
3. Cynthia is a careful driver. She is more careful than her sister She is the most careful of all new drivers.
4. Kate's marks are good. Her marks are better than her sister's. Her marks are the best.
5. Mark is strong. He is the strongest in her class. Jack. He is the strongest boy I know.
6. Spiro's Greek Restaurant is fantastic. It is more fantastic than Paolo's place. It is the most fantastic restaurant I know.
7. Prices are high this year. They are higher than last year. They re the highest ever!!
The words above are incomplete and they need to be properly written so that they would reflect the comparative and superlative forms.
Read more about comparative and superlatives here:
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