Chia đúng dạng động từ: 3. Oh, is it you, Jonh. You (not be) in touch with me for a long time. I am glad you (ring) me up. Where you (be) all these words? I hope you (not be) ill? 4. – I (ring) you up two days ago but I (get) no answer. Where you (be)? 5. we (study) a very hard lesson the day before yesterday. 6. I (read) that novel by Hemingway several times before. 7. We (study) almost everyday lesson in this book so far. 8. My wife and I (travel) to Mexico by air last summer. 9. I (have) a little trouble with my car last week. 10. The plane (stop) at a small town. It then (take) off immediately after refueling