1. chỉ nha khoa 

2. chỉ vàng

3. heo đất

a. Theo em hành động của Bách thể hiện sự không coi trọng tính mạng, xem thường tác hại  từ thiên nhiên

b.Em sẽ khuyên Bách ko nên làm như vậy bởi lốc xoáy rất mạnh nó có thể cuốn  Bách vào trong hoặc làm Bách mất mạng 

C

What country's language song is she singing?

I have many friends. However, I consider Thu to be my best friend. We have known each other for 5 years. Thu is a short girl with long black hair and white skin. What I like most about Thu's personality is that she is very kind and helps people around her. She always helps other students in class. I'm not good at Math so she often tutors me after school. Whenever I have free time, I go to her house to play and watch movies. Overall, Thu is a great friend that I will always cherish. I hope we can be friends forever.