12. I haven't returned my primary school for 7 years. A. I have returned in my primary school for 7 years. B. I last returned my primary school 7 years ago. C. I didn't return my primary school 7 years ago. D. It’s 7 years since I have returned my primary school. 13. He started learning French six years ago. A. He has learned French for six years. B. It was six years ago did he start learning French. C. He hasn’t learnt French for six years. D. It is six years since he has learned French. 14. I have never eaten this kind of fruit before. A. I have eaten this kind of fruit for a long time. B. This is the first time I have eaten this kind of fruit. C. This is the last time I have eaten this kind of fruit. D. I last ate this kind of fruit a long time ago. 15. "I'm going to have a job interview tomorrow," said Paul. A. Paul said that he was going to have a job interview tomorrow. B. Paul said that I am going to have a job interview tomorrow. C. Paul said that I was going to have a job interview the following day. D. Paul said that he was going to have a job interview the following day. 16. “What have you done to my laptop, Jane?” asked Tom. A. Tom asked Jane what she had done to his laptop. B. Tom asked Jane what had she done to his laptop. C. Tom asked Jane what has she done to his laptop. D. Tom asked Jane what she has done to his laptop. 17. Bill didn’t study hard enough. He didn’t pass the final exam. A. If Bill hadn’t studied hard enough, he would have passed the final exam. B. Without studying hard enough, Bill would pass the final exam. C. Had Bill studied hard enough, he would have passed the final exam. D. But for studying hard enough, Bill would have passed the final exam. 18. The Internet connection was not stable. The teacher couldn't conduct the online session successfully. A. If the Internet connection had been unstable, the teacher could have conducted the online session successfully. B. Suppose that the Internet connection hadn't been stable, the teacher could conduct the online session successfully. C. But for the unstable Internet connection, the teacher could have conducted the online session successfully. D. Without the stable Internet connection, the teacher could conduct the online session successfully.