Chia các động từ trong ngoặc ra thì simple past hoặc present perfect: 1) We (study)...............a very hard lesson the day before yesterday 2) We ( study)................................................almost every lesson in this book so far 3) We ( never/ watch)..........................that television program........................... 4) We (watch).....................an interesting program on television last night............... 5) My wife and I........................................( travel) by air many times in the past 6) My wife and I (travel).................................. to Mexico by air last summer 7) I (read)..................that novel by Hemingway sevaral times before. 8) I (read).........................that novel again during my last vacation. 9) I (have).........................a little trouble with my car last week. 10) However, I (have)......................... no trouble with my car since then.