5) It was nosy.The children............. a party
A) were having B) had C) had had D) was having
Câu trước là quá khứ
6) There was a time when letter.............................really a means of comunication
A) were B) was C) had been D) has been
7) At last the bus came.WE ..........................for half an hour
A) waited B) was waiting C) have waited D) had been waiting
Hiện tại hoàn thành
8)Everyone.............................when he......................to the party
A) were dancing/came B) danced/came C) was dancing/came D) danced /was coming
Qúa khứ đơn
9)I...................difficult Math puzzles since I..........a child
A) solved/have been B) had solved /was C) have solved/was D) solved/was
Sau since chia ở quá khứ đơn
10)My mother .................................as a shop assistant when she ....................a student
A) use to work/was B) used to worked/was C) use to worked/was D) used to work/was
S + used to + V