• Social media have a strong influence on our children, B. so parents with teenage children must be very cautious about what their children see on social media.

• Tom is a member of the language club, C. but he never takes part in any of the activities.

• The teacher told us never to cheat on the exam; C. otherwise it can seriously damage our result.

• Playing video games is fun, A. but it can be dangerous too.

• I didn’t like the ending; B. however it was a very good movie.

• My father likes football very much; C. therefore he always watches the World Cup.

• I had pressure from schoolwork; C. therefore I didn’t talk to my teacher.

• He’s only 16; B. therefore it’s against the law to buy alcohol without his parents’ observation.

• Teens should turn off their smartphone before sleeping; C. otherwise it can be harmful to their health.

• Peter is a big bully, C. so all his friends avoid him wherever possible.

• I check the notifications regularly, C. so I sell kid’s clothes on Facebook shop.

• Mi likes speaking English very much, B. and she often goes to the language club.

• You should turn off the phone and concentrate on your lesson, D. or you will fail the exam.

• Teens may be able to communicate with peers and other people; B. therefore they will develop social skills.

• Ms. Lan is a very tolerant teacher, D. so we love her so much.

• Chi loves her husband so much; B. however she doesn’t get along well with her mother-in-law.

• Do you want to join us B. or do you want to leave now?

• I love cats, B. but my mother doesn’t allow me to have one.

Giải thích chi tiết từng câu:

1. Social media have a strong influence on our children, parents with teenage children must be very cautious about what their children see on social media.

   • Đáp án: B. so
   • Giải thích: Câu này diễn tả mối quan hệ nhân quả: Vì mạng xã hội có ảnh hưởng lớn đến trẻ em nên bố mẹ cần cẩn trọng.

2. Tom is a member of the language club, he never takes part in any of the activities.

   • Đáp án: C. but
   • Giải thích: Câu này thể hiện sự đối lập: Tom là thành viên câu lạc bộ nhưng lại không tham gia hoạt động nào.

3. The teacher told us never to cheat on the exam; it can seriously damage our result.

   • Đáp án: D. for
   • Giải thích: Câu này đưa ra lý do cho lời khuyên của giáo viên: không nên gian lận vì sẽ ảnh hưởng đến kết quả.

4. Playing video games is fun, it can be dangerous too.

   • Đáp án: D. and
   • Giải thích: Câu này liệt kê hai khía cạnh của việc chơi game: vừa vui vừa có thể nguy hiểm.

5. My father likes football very much; he always watches the World Cup.

   • Đáp án: D. so
   • Giải thích: Câu này thể hiện kết quả: Vì bố thích bóng đá nên luôn xem World Cup.

6. I had pressure from schoolwork; I didn't talk to my teacher.

   • Đáp án: B. however
   • Giải thích: Câu này thể hiện sự đối lập nhưng vẫn liên quan: mặc dù có áp lực học tập nhưng người nói lại không chia sẻ với giáo viên.

7. He's only 16; it's against the law to buy alcohol without his parents' observation.

   • Đáp án: D. Therefore
   • Giải thích: Câu này đưa ra kết luận: Vì mới 16 tuổi nên không được mua rượu.

8. Teenagers should turn off their smart phone before sleeping; it can be harmful to their health.

   • Đáp án: D. because
   • Giải thích: Câu này đưa ra lý do.