Solution:
- 1. Paolo is the tallest member of our team. He's more than two metres tall.
- 2. My sister's hair is darker than mine. Hers is nearly black.
- 3. Jay is nearly 18. He's a bit younger than Ana.
- 4. Everyone loves Elena. She's one of the most popular students in the school.
- 5. Asia is 44,000 km², so it's the largest continent in the world.
- 6. The world's largest dinosaurs weighed more than 100 tons. One of these animals was heavier than ten elephants.
- 7. It isn't cheap to live in Tokyo. It's one of the most expensive cities in the world.
- 8. Cumberland Road is the busiest street in our town. It's always full of traffic.
Answer: 1. tallest, 2. darker, 3. younger, 4. most popular, 5. largest, 6. heavier, 7. most expensive, 8. busiest