__ ______ do you think of the book written by Dr. Wang? — In my opinion, it is not very interesting.
Was it because she was ill______she didn’t go to attend the meeting?
The machine has been used for several years. It needs______.
Be quiet______you will wake the whole house!
—Are you still employed at the post office? —Yes,I______here since 1982.
_____a written permission, he had to write another letter to the president of the university.