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