55. Without water and air, people die. A. People will die if there is no water and air. B. If there were no water and air, people would die. C. People will not die if there is no water and air. D. If there were no water and air, people would not die. 56. If you_____________ that plane, you _____________ dead now. A. had caught / would have been B. caught / would be C. had caught / would be D. catch / will be 57. I would have said "good bye" to your brother if he_____________ there. A. could be B. had been C. will be D. will have been 58. If you_____________ what Nam is doing, you _____________ very surprised A. had known / would be B. knew / would be C. knew / would have been D. knew / will be 59. I _____________ very happy if there _____________ a good film on channel 9 last night. A. would be / had been B. would have been / would be C. would have been / had been D. had been / had been 60. If you see Tom, _____________ you mind _____________ him to get in touch with me? A. will / reminding B. will / to remind C. would / reminding D. would / to remind 61. If the train is late, we_____________ to the office. A. walk B. will walk C. would walk D. walks 62. She _____________if she has time. A. calls B. would call C. will call D. calling 63. If it _____________too much, I will buy the smaller one. A. costs B. will cost C. would cost D. cost 64. If the class _____________full, we will find another one. A. are B. will be C. were D. is 65. What will we do if the taxi_____________? A. don’t come B. didn’t come C. doesn’t come D. had not come