4. She hasn’t written to me for 3 years A. It’s 3 years when she wrote to me. B. It’s 3 years since she writes to me. C. It’s 3 years since she wrote to me. D. It’s 3 years since she has written to me. 5. After she had explained everything clearly, we started our work. A. By the time we started our work, she had explained everything clearly. B. Before we had started our work, she explained everything clearly. C. After we started our work, she had explained everything clearly. D. After we had started our work, she had explained everything clearly. 6. He started working in this company five years ago. A. He has worked in this company for five years. B. It was five years ago did he start working in this company. C. He hasn’t worked in this company for five years. D. It is five years since he has worked in this company. 7. We last visited Ho Chi Minh city 3 years ago. A. We didn’t visit Ho Chi Minh city for 3 years. B. We haven’t visited Ho Chi Minh city for 3 years C. We haven’t visited Ho Chi Minh city for 3 years ago. D. We didn’t visit Ho Chi Minh city for 3 years ago. 8. She has taught her children to play piano for 4 years. A. She started teaching her children to play piano 4 years ago. B. She started to teaching her children to play piano 4 years ago. C. She started teaching her children to play piano for 4 years ago. D. She started teaching her children to play piano since 4 years. 9. She had learned English for five years and then she went to London. A. She had learned English for five years before she went to London. B. She had learned English for five years after she went to London. C. She learned English for five years before she went to London. D. Before she had went to London, she learned English for five years. 10. We started to write to each other three years ago. A. We used to write to each other for three years. B. We have written to each other for three years. C. We wrote to each other since three years. D. We used to write to each other in three years. 11. He last had his eyes tested a year ago. A. He hadn't tested his eyes for a year. B. He didn't have any tests on his eyes in a year. C. He hasn't had his eyes tested for a year. D. The last time he tested his eyes was a year ago 12. He started working as an engineer 5 years ago. A. He worked as an engineer 5 years ago. B. He had worked as an engineer for 5 years. C. He didn't work as an engineer any more. D. He has worked as an engineer for 5 years. 13 The last time she saw her elder sister was in 1999 A. She hasn’t seen her elder sister since 1999. B. She has seen her elder sister since 1999 C. She hasn’t seen her elder sister in 1999. D. She haven’t seen her elder sister since 1999