11. Do you get your heating..every year? A. checking B. check C. be checked D. checked 12. Bicycles..in the driveway A. must not leave B. must not be leaving C. must not be left D. must not have left 13. Beethovens Fifth Symphony..next weekend A. is going to be performed B. has been performed C. will be performing D. will have perform 14. All bottles..before transportation A. frozen B. were froze C. were frozen D. are froze 15. ..yet? A. Have the letters been typed B. Have been the letters typed C. Have the letters typed D. Had the letters typed 16. English has become a second language in countries like India, Nigeria or Singapore where..for administration, broadcasting and education A. is used B. it is used C. used D. being used 17. The telephones..by Alexander Graham Bell A. is invented B. is inventing C. invented D. was invented 18. Lots of houses.by the earthquake A. are destroying B. destroyed C. were destroyed D. is destroyed 19. Gold.in California in the 19th century A. was discovered B. has been discovered C. was discover D. they discover 20. The preparation..by the time the guest. A. had been finished- arrived B. have finished- arrived C. had finished-were arriving D. have been finished- were arrived Cứu tui với, sắp pk nộp bài rồi, hứa sẽ vote đủ