Which one is bigger, Hoan Kiem Lake or Hong River

1.Which one is bigger, Hoan Kiem Lake or Hong River?
2. Which one is nosier, life in the city or life in the countryside?
3. Which one is smaller, Ben Thanh Market or Dong Xuan Market?
4. Which one is longer, the ruler or the pen?
5. Which one is busy, life in the city or life in the mountains?
6. Which one is bigger, house’s elephant or house’s ant?