Bài 1: Chọn từ when/ while: 1. I was having lunch . James arrived. 2. I heard the doorbell, I went to the door. 3. .. Jo was washing her hair, I did my homework. 4. .. I buy the bread, you can go to the butchers. 5. I was at the bakers . I met Jo. 6. The customer was being helped by the salesman .... the thief came into the store. 7. you saw Keith, was he with Jo? 8. I was in the shop . someone stole my bag. 9. I hurt my back I tried to lift the piano. 10. .. we were standing outside the cinema, someone picked my pocket. 11. . Mrs Scott came back to her hotel, she called the elevator. Bài 2: Điền từ : when, while, before, after vào chỗ trống: Câu 1: He cleaned his teeth __________ he went to bed. Câu 2: The ambulance arrived at the scene five minutes __________ the accident had happened. Câu 3: __________ I am older, I want to start my own business. Câu 4: I went straight to the hospital __________ I heard about your accident. Câu 5: They took short breaks every half an hour __________ they were playing tennis. Câu 6: Rebecca went to bed __________ she got home because she was so tired. Câu 7: People should be very careful __________ they cross busy roads. Câu 8: Paul found somebodys wallet on the ground __________ he was walking to the bus stop.