Chủ đề:
Luyện tập tổng hợpCâu hỏi:
1. I was shopping when I............
2. Someone knocked the door while I.............................that day
3.While my father was watching news,my sister........................
4. A burglar...............................when he was caught
5. Thang told me that when he was young,while....................................his uncle‘s cottage, a rat bit his finger
6. They were chatting on facebook when.....................................