People think that students should wear uniforms when they are at school

1. People think that students should wear uniforms when they are at school.
-> It....
2. "Why don't you visit the Royal Citadel, Hoa?" Hoang said 
-> hoang suggested ....
3. They has built a new school in my neighborhood. 
-> A new school.....
4. "I'm going on business tomorrow." said Ann.
-> Ann said