31. C (Lỗi dùng mạo từ). Sửa lại: Students can play and learn languages from other students all over the world.
32. C (Lỗi dùng cấu trúc "not only...but also...). Sửa lại: The Internet has made it possible not only to quickly find and share information, but also to contact people from all over the world.
33. C (affect:(affect somebody) tạo ra ảnh hưởng=>sửa thành effect: ảnh hưởng, kết quả (effect on somebody). Sửa lại thành: Computer games can be bad and have negative effects on our society and individuals.
34. C (Câu Although giữa 2 mệnh đề dùng dấu phẩy(,), không dùng but). Sửa thành: Although the weather was bad, the match was not cancelled.
35. D (dùng trạng từ badly) . Sửa thành: We don’t trust Tu because he often behaves badly.