Dạ, key từ giáo viên cung cấp ạ
1. unclear
2. 250
3. 50%
4. the west
5. ineffective
6. back pain, headaches
7. back pain, headaches
8. (Ancient) Greece
9. enhance concentration/enhancing concentration and protect the heart/protecting the heart
10. enhance concentration/enhancing concentration and protect the heart/protecting the heart