III. Choose A, B, C, or D to fill in each gap in the following sentences: 9. I ______ forget my key, or I won't get in. A. must B. mustn't C. should D. don't have to 10. The sign at the check-in desk says: "Passengers _______ show their tickets." A. might B. may C. must D. can 11. The doctor said to him: "You ______ exercise or you certainly have a heart attack again. A. must B. mustn't C. don't have to D. may 12. My best friend ______ big brown eyes and a round face. A. has B. does C. gets D. takes 13. Nam is such a/an ______ student. He joins many clubs in my school. A. activity B. active C. activities D. actively 14. My Uncle seldom smiles. He is always ________. A. serious B. seriousness C. series D. seriously 15. Thanh doesnt have many friends. Mike has lots of friends. Mike is ______ than Thanh A. more sociable B. more careful C. older D. bigger 16. We will save the environment if we ___________ plastic. A. reuses B. reuse C. reusing D. reused 17. We are trying to __________ the president to the party. A. pollute B. exchange C. invite D. cause 18. Why dont we __________ old school objects for candies? A. swap B. raise C. wrap D. recycle 19. They use ________ plastic bottles to keep water. A. refillable B. natural C. polluting D. charitable 20. In the future, I _________ in a villa. A. will live B. live C. am living D. lived 21. Amsterdam is one of the ________ cities in the world. A. peacefulest B. peacefuler C. most peaceful D. more peaceful 22. _________ the film is late, I will wait to watch it. A. But B. When C. So D. If 23. My father first __________ Da Lat in 2010. A. go B. went C. visited D. been 24. __________ you go to Holland when you were small? A. Have B. Did C. Will D. Are 25. Angkor in Cambodia has been listed as a UNESCO World ____________. A. Wonder B. City C. Country D. Heritage 26. The ____________ will announce tomorrows weather on TV at 7:30 tonight. A. weatherman B. newsreader C. comedian D. MC 27. His mother enjoys ____________ this series on television. A. watching B. going C. doing D. having 28. You should buy a new __________ to play badminton. A. pedal B. table C. racket D. shoe 29. Yesterday, he _________ judo for 3 hours. A. went B. did C. got D. played 30. London is one of the most interesting city I ____________. A. ever visit B. have ever visited C. ever visited D. will ever visit