Fill in the gaps with the comparative or the superlative form

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.