I wonder why Jack always gets good marks when he does only ______ the others.
“Where did you find the professor who made the speech yesterday?” “It was in the hall ______ the students often have a meeting.”
It may have been at Christmas _____ John gave Mary a handbag.
_____ was very ______ that little Jim wrote the letter.
What is it _____ his daughter needs most?
Who was it _____ saved the drowning girl?