We don’t know _________. She is new here.

—__________ have you been in the sports club?—Since the first month I came to the school．

Sam is a very good man. He always tries __________ best to help others. 

—Is this         new book, Shirley?—No, it isn’t. Maybe it’s           .

— “May I drink _______ water?”  --- “Sorry, I don’t have _____.”