1. is the first time my sister has ever made a speech
2. working on his project 2 weeks ago
3. we could come back here next month
4. to work harder than he does
5. to tradition, people in this area worship their ancestors
6. unnecessary for us to read all these volumes
7. did you build this stilt house?
8. more convenient to live in a big city than to live in a village
9. have to wear uniform when they go to school
10. to be many traffic accidents before
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