giúp mình với ạ, cần đáp án thoii

Here are the answers to the exercise: 1. She has been learning English for three years. 2. I haven't eaten anything since breakfast. 3. He has never driven a car before. 4. We have known each other since we were at high school. 5. We haven't had any problem so far. 6. I have drunk four cups of coffee today. 7. John has lived in Denver since 2017. 8. - You have ever climbed Mount Everest? - No, I haven't. But I'm sure I will, if I have a chance. 9. We haven't seen each other for a long time. 10. I have forgotten my key. I can't unlock the door now. 11. That is the third time he has called her this evening. 12. The police have arrested two men in connection with the robbery. 13. Susan has seen that film eight times! 14. You have already read the book? What do you think? 15. I had never been to a zoo before. It is a nice feeling to go somewhere you have never been before. However, note that there's a better answer for the question 15 in terms of grammer, the question should use present perfect in the first sentence to match the second one, so: 15. I have never been to a zoo before. It is a nice feeling to go somewhere you have never been before. Here are the answers to the exercise: 1. He **has been waiting** all morning. 2. Richard **has been doing** the same job for 20 years. 3. I **have been studying** English for six months. 4. Mike **has been working** in Las Vegas for the last few months. 5. It **has been raining** since lunchtime. 6. Helen **has been reading** this book for three days. 7. Kevin **has been looking** for a job since he finished school. 8. I'm tired of waiting. I **have been sitting** here for one hour. 9. He is exhausted because he **has been working** continuously for more than twelve hours. 10. She **has been sleeping** for 10 hours! You must wake her. 11. He **has been reading** this book for two hours, but he hasn't finished it yet. 12. That boy **has been waiting** for the bus for half an hour. Shall I tell him that the last bus has already gone? 13. They **have been arguing** very excitedly all this time. Shall I come and interrupt them? 14. What have you done with my bag? I **have been looking** for it for an hour and I haven't found it yet. 15. I **have been thinking** over what you said since yesterday.