Đề bài ở trên

1. Last night, I lost my keys so I called my roommate. 2. I lost my keys so I am finding them now. 3. She has visited Thailand three times. 4. She visited Thailand three times last year. 5. I knew my great grandmother for a few years but she died when I was 6 years old. 6. I have known Tommy for a long time since we were kids. 7. He played the piano at school but he didn't like it. 8. He has been playing the piano since he was small. 9. We finished the test last week. 10. We have already finished the exam.