— _______ iphone4 is this on the table?— I think it’s my sister’s.

Which do you prefer, tea or coffee? —_______. I really don’t mind. 

—Have you seen my dictionary? ---- Is it _______ you bought last week? Perhaps _______ is on your bed.

Life in the 21st century is much better than_____ used to be.

The American people will never forget the 9.11 event and the psychological trauma __________ caused to hundreds of thousands of common households.