Because I’m a teacher today. And students, put down your pencils, and hand in your papers.
hand in 交出去 hand out 发下去
Sorry, time's up.
Please give me another minute.
Time's up.也可说：The time is up. 或Your time is up.
Stop writing.
You know usually my students don't ask me to "Please give me another minute." They just keep writing. They don't stop.
To burn the midnight oil. 临时抱佛脚，开夜车。