Question 17. Customs duty _____ wallpaper is almost 50% so I don’t think is it a good idea to buy it abroad. 

      A. for                                    B. on                                    C. at                                     D. of

Question 18. Researchers are making enormous progress in understanding ________

      A. a tsunami is what and what causes it                           B. what a tsunami is and what causes it 

      C. what is a tsunami and what causes it                           D. is what a tsunami and what causes it

Đề thi thử THPT 2021 - Tiếng Anh - GV Vũ Thị Mai Phương - Đề 25 - có lời giải