—Mum, have you seen my U-Disk?—_______ you bought last Sunday? I'm-afraid I haven't seen _______.
Information technology is taught in most schools, ________ we have entered the information society.
My aunt has worked in a clinic ____2008.
My father is leaving ___ Shanghai tomorrow.
___ the morning of June 27, they visited the Great Wall.
For a person with reading habits, a printed page contains not only words ________ ideas, thoughts and feelings.