Cho dạng đúng của từ

1. My co-worker (had not used/didn't use) email before, so I showed him how to use
đúng.
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 (hadwashed/washed) her hands carefully.
10. Before I (had gone/went) out, I asked my parents for permissions.
11. I could not remember the name of the man we (met/hadmet) the week before.
12. We (ate/had eaten) all the cakes mymom had made.
13. Before she (came/had come) home, she had met some of her old friends.
14. Before Jane (started/ had started) to make the cake, she had prepared all the
ingredients.
15. I (hadfed/fed) my cat before I left home.