làm phần nào cũng được, giúp mình với sáng mai mình học rồi Choose the one word or phrase -a, b, c, or d- that best completes the sentences. 16. If the technology _______ available, we would be able to expand the business. a. would become b. were become c. had become d. Became 17. If the North Sea _______ in winter, you could walk from London to Oslo. a. happened to freeze b. froze c. should freeze d. should happen to freeze 18. It would have been a much more serious accident _____ fast at the time. a. was she driving b. had she been driving c. she had driven d. if she drove 19. If you _______ to my advice in the first place, you wouldn't be in this mess now. a. listen b. will listen c. had listened d. listened 20. I'll give you a lift if it _______. a. is raining b. rained c. will rain d. had rained 21. If I _______ a more reliable car, I ' _______to Spain rather than fly. a. would have - would drive b. had - had driven c. had - would drive d. would have had - would drive 22. I _______ you sooner had someone told me you were in the hospital. a. would have visited b. had visited c. visited d. visit 23. They couldn't decide _______ it was worth re-sitting the exam. a. if b. whether c. if or not d. whether not 24. _______ how difficult the job was, I mightn't have taken it. a. If I know b. If I would know c. Did I know d. Had I known 25. ____ in my seventies and rather unfit, I might consider taking up squash. a. Were I not b. Was I not c. Weren't I d. If I am not C. Identify the one underlined word or phrase -A, B, C or D-that must be changed for the sentence to be correct. 26. Some scientists believe that the earth have resources enough A B to support its population. C D 27. The population of the world has been increased faster and faster. A B C D 28. Ninety-seven percent of the world' water is saltwater is found in A B C the oceans of the Earth. D 29. Hadn't he resigned, we would have been forced to sack him. A B C D 30. John lived in New York since 1960 to 1975, but he is now living in Detroit. A B C D