One of our rules is that every student         wear the school uniform while at school.

For those who            go to college, there are still hundreds of high-paying jobs that only require a high school diploma.

—You look so tired. —Yes. The loud noise upstairs stopped me        the whole night.

Nobody knows for sure how dinosaurs died out 65,000,000 years ago. It _______ because of sudden changes of their living conditions.

--- Will Helen come to my party tonight?--- I am not sure. She _______ go to the cinema with her father.