Bài 3. 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 (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 several 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.