Which one of the underlined words or phrases is INCORRECT? I don't had enough money to buy a bus ticket, so I'll…

In which of the following sentences is all PUNCTUATION CORRECT?

I.......................... nonstop since this morning. I'm starting to feel tired.

If I ----------- more time, I --------------- more languages.

I think this is the worst chocolate cake I …………..

Linda was in the cafeteria when her friend ........her they had both passed the exam.