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Exercise 10: I was driving my car very fast when you called me. Exercise 15: 1. I was chatting with my friends while my teacher was teaching the lesson yesterday. 2. My father was watching TV when I got home. 3. At this time yesterday, I was preparing for my son's birthday party. 4. What were you doing at 8 pm yesterday? 5. Where were you going when I saw you last weekend? 6. They were not going to school when I met them yesterday. 7. My mother was not doing the housework when my father came home. 8. My sister was reading books while my brother was playing football yesterday afternoon. Exercise 16: 1. He has lost his room key. He has to stay outside. 2. He has seen this film twice. 3. I have asked him to dinner several times. 4. They have seen this film three times. 5. She has been to that place several times. 6. How many times has he made this kind of mistake? 7. It's the most interesting book I have ever read. 8. This is the most terrible song I have ever heard. 9. It's the second time we have visited his ancient church. 10. Is this the first time you have been in Vietnam? Exercise 17: 1. How long have you known Mr. Tom? - I have known him for ten years. 2. Have you ever eaten caviar? 3. Have you ever ridden a camel? 4. Have you ever left a restaurant without paying the bill? 5. Have you ever seen a real dragon? 6. Has this student ever practiced speaking English? 7. His child has never told a lie. 8. My friend has never come to class late. 9. Have you seen him lately? 10. I have already had breakfast. 11. I have just finished reading War and Peace. It's a brilliant book. 12. I have just sent the letter. 1. cozy # cold (ấm cúng # lạnh lẽo) 2. crazy # sane (điên khùng # tỉnh táo) 3. cry # laugh (khóc # cười) 4. dangerous # safe (nguy hiểm # an toàn) 5. dark # light (tối tăm # sáng sủa) 6. dead # alive (chết # sống) 7. early # late (sớm # muộn) 8. eccentric # normal (kỳ dị # bình thường) 9. encourage # discourage (khuyến khích # chán nản) 10. enjoy # dislike (thích # không thích) 11. big # small (to # nhỏ) 12. face # avoid (đối mặt # tránh)