He never thought that his success came ______ he least wanted it.

I’d like to study law at university __________ my cousin prefers geography. 

_________ going to the exhibition.

Milk will turn sour soon on hot days ______ it is stored in the refrigerator．

— Was it not until last week ______ he decided to give up smoking?— No. He began _____ he saw the new film last month.