1. Lan said she didn't know what she should wear.
2. My uncle moved to Danang because his work required so.
part 2
1. The most important goal of speaking English is to communicate
2. In VN, rice is one of staple foods
3. We eat only as much food as our body needs
4. At home parents encourage children to prepare lunchboxes
5. If you did more exercise, your muscles would be stronger