giải thik chi tiết thiếu giải thik là báo mod 14. A: John passed his exam with a distinction B: __________. A. He was too lazy to succeed. B. He can’t have studied very hard. C. He must have studied very hard. D. He needs studying harder. 15. The computer does not work. It _____during transportation. A. must have damaged B. should have been damaged C. must have been damaged D. can be damaging 16. You ______the air pressure in your tires if you do not want to get a flat tire on your trip A. should be checked B. do not have to check C. mustn’t D. ought to check 17. She ______a lot after her husband’s accident. That way why her eyes were so red and swollen A. mus be crying B. can have been cried C. will have cried D. must have cried 18. Hiking the trail to to peak ____be dangerous if you are not well prepared for dramatic weather changes A. might B. should C. had better D. mustn’t 19. Look! She is laughing. She _____ something funny or happy. A. must have B. must have had C. could have had D. should have had 20. Are you joking? David _____ a new car last week. I am sure that he did not have money. A. mustn’t be buying B. would be buying C. may have bought D. can’t have bought