3. Last night, I saw an old friend from high school while she was taking photos of Fansipan Mountain.
→ Last night, I saw an old friend from high school while she was taking photos of Fansipan Mountain.

4. I'm always arguing with my parents because they often set hard rules and refuse to let me hang out with friends.
→ I'm always arguing with my parents because they often set hard rules and refuse to let me hang out with friends.

5. My brother isn't talking to me because I forgot to meet him for a visit to the Old Quarter yesterday.
→ My brother isn't talking to me because I forgot to meet him for a visit to the Old Quarter yesterday.

6. Jack isn't worried about his future career because he knows he will work for the family business.
→ Jack isn't worried about his future career because he knows he will work for the family business.

7. The One Pillar Pagoda is a famous place of worship in Hanoi, while it has a unique architecture and looks like a lotus on the pond.
→ The One Pillar Pagoda is a famous place of worship in Hanoi, while it has a unique architecture and looks like a lotus on the pond.

8. Ba Bể Lake is among the most beautiful national parks in the country, while it was recognised by UNESCO as the third Ramsar site of Vietnam.
→ Ba Bể Lake is among the most beautiful national parks in the country, while it was recognised by UNESCO as the third Ramsar site of Vietnam.

9. Sarah, who is independent and always wants to do school projects on her own, is one of my close friends at high school.
→ Sarah, who is independent and always wants to do school projects on her own, is one of my close friends at high school.

10. The girl who won a free trip to Hạ Long Bay in the "Surprised!" show last summer is my classmate.
→ The girl who won a free trip to Hạ Long Bay in the "Surprised!" show last summer is my classmate.

11. The beach where I travelled to and took lots of beautiful photos last year is very famous.
→ The beach where I travelled to and took lots of beautiful photos last year is very famous.