Fill in the gaps with the comparative or the superlative form of the following adjectives.
1. Who's (young) person in your family?
2. Today the weather is (bad) than yesterday.
3. This pair of glasses is (expensive) in this shop.
4. This is (fast) car that we have.
5. Their flat is (big) than mine.
6. Japanese is (difficult) than English.
7. Is iron (heavy) than gold?
8. I have (much) than my brother.
9. His marks were terrible last year but now they're (good).
10. He's (careless) student in class.