Giải giúp mình với.

2. Before I passed the exam, I had worked very hard

3. After I had considered what to study, I decided to major in Maths

4. After she had written a letter, she went to bed

5. After he had checked the price, he bought a radio

6. After they had argured, he fought

7. Before she had a fatal accident, she had gone out for a walk

8. After she had faced the matter, she decided to go away

9. Before we wrote the assignment, we had read the book

10. After she had watched the film, she wrote a report

EX6

1. Swimming everyday is a good way of keeping fit

2. Learning a foreign language takes a long time

3. Growing your own food is less expensive

4. Sitting in one place for so long is uncomfortable

5. Smoking here is prohibited