Помогите пожалуйста с 3, 4, 5 и 6 заданиями

1. Russia is bigger than the USA. 2. Computer games are more expensive than board games. 3. New mobile phones are better than old phones. 4. Tarantulas are more dangerous than house spiders. 5. Comedies are funnier than documentaries. 6. MP3 players are smaller than CD players. 1. The tallest 2. The most difficult 3. The easiest 4. The worst 5. The cheapest 6. The most exciting 1. I could talk when I was two. 2. My friends couldn't go to the disco. 3. Could you speak English last year? 4. I could ride a bike two years ago. 5. Could you play chess ten years ago? 1. Should 2. Shouldn't 3. Should 4. Should 5. Shouldn't