18. arriving at the airport, I saw that wanted man
19. came home, he had had lunch in this restaurant
20. had done my homework, I went to bed
21. because we missed the bus
22. had told him off, I realized I was wrong
23. câu này sai đề nha, ko viết lại với by the time được
24. had considered what to study, I decided to major in Math
25. After she had written a letter, she went to bed
26. Before he bought the radio, he had checked the price
27. was skiing in Switzerland, he met his old friend Ken
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