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1. Ba asked Lan if his father worked in a hospital.
2. She has worked for this company for 10 years.
3. Bill has lost his car which he bought last month.
4. Unless she has a visa, she can't visit Thailand.
5. Mr.Brown, whose team has lost the game, looks very sad.
6. You know the man who sat next to me at Nam's birthday party last night, don't you?
7. Minh spends 2 hours doing his homework every day.
8. Because it rained heavily, we were late for school.
9. This doctor, whom you visited yesterday, is famous.
10. Unless he works harder, he'll lose his job. 
11. It is the first time I have been here.

12. The children who are playing there are lovely.
13. Although the weather was bad, they had a wownderful holiday.
14. Lan asked me what time I went to school.
15. Hung, whom I have known for 9 years, is one of my closest friends.
3. A new bridge has just been built in Binh Dinh recently.