Đề : Mark the letter A, B, C or D to indicate the correct answer to each of the following questions. 12. I didn't meet him right away ____ he had to talk to his boss first. A. while                   B. if                 C. because                  D. or 13. ____ I were you, I would never return. A. If                        B. Unless         C. While                       D. After 14. There wasn't a chair for the headmaster, ____ is a big problem. A. what                   B. which                C. that                   D. where 15. The teacher requested that our homework ____ before class. A. is done    B. do    C. be done    D. to be done 16. The student wiped the board ____ was full of notes and drawings. A. that                    B. while                 C. after                  D. so 17. Incomplete ____ often gives off toxic things. A. energy    B. resource    C. pollution    D. combustion 18. We are having ________ nice trip in _____ centre of this country. A. the – the    B. a – the       C. Ø - the        D. the – a 19. I ____ out last night when I ____ that I had left my wallet at home. A. was going– realized                                                B. went – realized C. had gone – would realize                                                 D. would go - have realized 20. “I am so happy. I have just passed my history exam.”     - “______________” A. Congratulations!                B. What's the matter?             C. Get well soon!                   D. Thanks a lot. 21. Jenny: "I think higher living standard is one of the reasons that many people want to be a city dweller." Mark: “____” A. I couldn't agree more.                                                       B. It's nice of you to say so. C. That's quite all right.                                                         D. Why not? 22. ____ Gordons is a very interesting family. They like to travel around ____ world. A. A – the               B. The - the             C. A – a                       D. A - Ø 23. The impact of increased ____ has been harmful to the environment and has led to the growth of greenhouse gas emissions. A. agriculture    B. environment    C. economy    D. urbanisation Giúp tui với 🤧