Seldom _________ any mistakes during my past five years of teaching in this university.
| A．would I make | B．I did make |
| C．should I make | D．did I make |
We have every reason to believe that __________ 2012 London Olympics will be ________ great success.
| A．a; / | B．the; / | C．the; a | D．a; a |
—Madam, could you please tell me how to get to the nearest post office?
—_______
| A．That’s all right. | B．Let me think. |
| C．Why not? | D．Well, never mind. |
Entering the room, I found Mary ______at the desk and ______a letter.
| A．Seated；wrote | B．Sitting；written |
| C．Seating；writing | D．Seated；writing |
_________on the main street, the market was busy yesterday.
| A．Located | B．locating | C．being located | D．to be located |
They were surprised that a child should work out the problem _____ they themselves couldn’t.
| A．when | B．where | C．until | D．while |