1. I have never met him before.

2. No one in her class is more intelligent than her.

3. I haven't seen Peter for 5 months.

4. Living in Hanoi is more expensive than living in Hoa Binh.

5. She likes watching romantic comedy films.

6. This is the first time I have ever eaten such a delicious cake.

7. Paris is the most beautiful city in the world.

8. This is the first time I have met this boy.

9. If we use the car all time, we will make the air dirty.

10. Unless I leave now I won't miss the train.

11. If I don't have a modern robot, I won't be able to do everything myself.

12. Minh is interested in teaching robots.

My answer!!!