Question 51: I my old school teacher last week. A. visited B. visit C. am visiting D. have visited Question 52. If you knew he was ill, why ______ you ________ to see him? A. didn't / come B. wouldn't / come C. should / come D. would / come Question 53. They _______ tired now because they ________ in the garden since 8 o'clock. A. are / worked B. were / were working C. are / have been working D. were / worked Question 54. Women no longer have to do hard work nowadays as they used to, _______. A. are they B. aren't they C. do they D. don't they Question 55. You _______ Tom yesterday. He's been away on business for a week now. A. mustn't have seen B. could not have seen C. may have not seen D. can't have seen Question 56: She agreed that all the present paperwork _____ for everyone to have more time to socialize. A. stopping B. be stopped C. to stop D. stopped Question 57: The speaker fails to get his message _______to his audience. A. around B. in C. across D. out Question 58: Air pollution is getting _______ serious in big cities in the world. A. more and more B. the more and the more C. the most and the most D. most and most Question 59: The authorities _______ actions to stop illegal purchase of wild animals and their associated products effectively. However, they didn't do so. A. needed have taken B. should have taken C. had to take D. must have taken Question 60: The scientists _______ on this project try to find the solutions to air pollution. A. working B. worked C. are working D. who working Question 61: if some endangered species ______ in zoos, it would help to ensure their future survival. A. will be kept B. are kept C. had been kept D. were kept Question 62: Susan rarely stays up late,______? A. is she B. isn't she C. does she D. doesn't she Question 63: It is vital that everyone ______ aware of the protection of the environment. A. is B. be C. are D. were Question 64: This is the second time you ______ your door key. A. are losing B. lose C. lost D. have lost Question 65: Not until 1856 ____ across the Mississippi River. A. the first bridge was built B. was the first bridge built C. the first bridge built D. did the first bridge build