Chia động từ trong ngoặc ra thì simple past hoặc present perfect:
1 We (study) ..............are very hard lesson the day before yesterday
2 We (study)...........almost every lesson in this book so far
3 We never (watch).............that television progam
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