You look tired today....................... all night?

Which sentence has the CORRECT WORD ORDER?

This old computer is broken! I ................................ it.

Cathy said her teacher ... at 5:30, but she actually came at 6:30.

If I. .......... how a good teacher Mr. Taylor was, I would have enrolled in his class years ago.

Lisa forgot her bag at the university, so she ....................... go back and get it.