các bạn giải thích giùm mình vì sao chọn câu trả lời này nha 1. As Geoff was introduced to Mrs Snape, he realized (realize) that he had met (meet) her before. 2. During the previous week, I went (go) to the gym every morning. 3. By the time I got (get) back to the bathroom, the bath had overflowed (overflow). 4. The boy told me that he had lost (lose) his train ticket and didn’t know (not/ know) how he would get home. 5. I was just about to leave when I remembered (remember) my briefcase. 6. She walked (walk) into the station only to find that the train had left (leave). 7. At the conference, scientists reported that they had found (find) a cure for Malaria. 8. On my last visit to Wixton I found (find) that the village hadn’t changed (not change) much. 9. In a surprise move, the Prime Minister resigned (resign) last night. 10. Jane didn't want any dinner. She had eaten (eat) already. 11. When she came (come) into the hall, everyone started (start) cheering. 12. After they had eaten/ ate (eat) all the food, they picked (pick) up their bags and left. 13. I thought I would get to the restaurant first, but Jim had arrived (arrive) before me. 14. By the time I got (get) to the party, most people had gone (go) home. 15. As soon as I turned (turn) the ignition key, the engine caught (catch) fire. VII. Choose the correct answer. 1. After Jessica ____ her degree, she intends to work in her father's company. a. will finish b. finishes c. finished d. is finishing 2. As you ________ your car at the moment, can I borrow it? a. don't use b. didn't use c. aren't using d. haven't used 3. When she saw a snake at her feet, she ________. a. screamed b. was screaming c. had screamed d. screams 4. When he realised that I ________ at him, he ________ away. a. looked - was turning b. was looking - turned c. was looking - was turning d. looked - turned 5. I ___ the new Harry Potter book now, so you can borrow my copy if you like. a. finish b. am finishing c. have finished d. had finished 6. I was sure that I ________ him before. a. met b. had met c. have met d. was meeting 7. Before I started the car, all of the passengers ________ their seat belts. a. will buckle b. had buckled c. was buckling d. have buckled 8. The minute I got the news about Sue I ________ my parents. a. phoned b. was phoning c. had phoned d. have phoned 9. A lot ________ since I last ________ you. a. happened - saw b. happened - have seen c. has happened - saw d. has happened - have seen 10. Your eyes are red - ________? a. did you cry b. have you been crying c. have you cried d. do you cry 11. A small stone struck the windshield while we _______ down the gravel road. a. drive b. were driving c. had driven d. had been driving 12. In the next few year, thousands of speed cameras ________ on major roads. a. are appeared b. will appear c. are appearing d. are going to appear 13. After she ________ hospital, she had a long holiday. a. leaves b. is leaving c. left d. has left 14. ________ for a long time before you got a job? a. Were you looking b. Have you looked c. Have you been looking d. Had you looked 15. The film _______ by the time we ________ to the cinema. a. already began - got b. have already begun - got c. had already begun - got d. already began - had got