Student: Sir, I have finished the quiz. Teacher: What? We only started ten minutes ago. You ________ possibly have finis…

In which sentence is all PUNCTUATION correct?

Professor Harris has been reading in his office ...................... eight hours without taking a break.

In which sentence is all CAPITALIZATION correct?

Tom's car broke down, so he's ............... He didn’t know how to fix it himself.

If you promise to keep a secret, I ................ you what happened.