Choose the correct answer: 1. tom's car is as big as /the biggest his friend's. 2. who is shorter than /the shortest person in your family? 3. who is more independent than / the most independent person you know? 4. these sofas are more comfortable than / the most comfortable ours. 5. my brother is taller than /the tallest in the class. 6. is jason's dog older than /the oldest yours? 7. who is the best /bettrthan singer in the world?