Bài 7: Khoanh tròn vào đáp án đúng. 1. My co-worker (had not used/didn’t use) email before, so I showed him how to use it. 2. Because I (hadn’t studied/didn’t study) for the test, I was very nervous. 3. The wave (had destroyed/ destroyed) the sandcastle that we had built yesterday. 4. When shewent out to meet her friends, she (had already done/ already did) all the chores. 5. The waitress brought a drink that I (didn’t order/ hadn’t ordered) before. 6. (Had you given/ did you give) James a ring before you dropped by his apartment? 7. Susan (took/had taken) a rest after she had washed all the dishes. 8. When Jim came to the meeting, everyone (had left/left). 9. Before she had dinner, she (had washed/ washed) her hands carefully. 10. Before I (had gone/went) out, I asked my parents for permissions.