15. Sam will not graduate unless he ________ all the tests. A. passes                     B. passed                     C. had passed             D. pass 16. Can I have a pizza, a dozen eggs and a ________ of lemonade, please? A. piece                       B. tub                          C. bottle                      D. jar 17. Parking is very difficult in _______ city centre, so my father always goes there by _______ bus. A. the x                    B. the the                 C. a a                        D. a x 18. When she came _______, she found herself in hospital. A. round                      B. off                          C. over                        D. out 19. Mike comes from a city _________ is located in the southern part of England. A. when                      B. that                                     C. where                     D. who 20. Pham Tuan said everything ______ quite strange although he _______ when he was on the ground. A. was had prepared                                    B. had been prepared C. was prepared                                           D. was has prepared 21. You should give up ________ or you will die of cancer. A. smoke                     B. to smoke                 C. smoking                  D. smoked V. Find the mistake among the underlined words or phrases. 22. If (A) you do not understand (B) what were written (C) in the book, you could ask (D) Mr. Pike. 23. Getting (A) enough sleep is (B) important in order (C) not fall (D) asleep is class.