Dựa vào đoạn văn, đây là các lựa chọn tốt nhất cho từng chỗ trống:

1. **A. different** - Teenagers today live in a world that is different from that of previous generations.
2. **A. gain** - With the rapid development of technology, they have access to information and social media at their fingertips.
3. **C. enhance** - On one hand, the internet helps them enhance knowledge and learn about the world.
4. **D. quality** - It can be a distraction from important tasks, such as studying and spending quality time with family.
5. **B. share** - Social media is an essential part of their lives. They use it to connect with friends and share their thoughts and experiences.
6. **A. avoid** - Spending too much time on screens may lead to avoid problems, like sleep issues or a lack of exercise.
7. **A. health** - Schools and parents can help teenagers develop healthy habits.
8. **B. study** - It is also essential for teenagers to manage their time effectively to study.
9. **D. find** - Overall, teenagers need guidance to find these important years.

Bạn có thể kiểm tra lại các lựa chọn này để phù hợp hơn với ngữ cảnh đoạn văn.