_______the room，I found my cat lying on the floor，dying．
| A．To enter | B．Enter | C．Entering | D．Entered |
The world was deeply ________ with the Green Olympics held in China in 2008.
| A．encouraged | B．offered | C．impressed | D．covered |
The students were ________ over the ________ problem，listening to the teacher with a ________ expression on their faces.
| A．puzzled；puzzling；puzzling | B．puzzled；puzzling；puzzled |
| C．puzzling；puzzling；puzzled | D．puzzling；puzzled；puzzling |
The two sides have reached a partial agreement, but several differences still ________ between them.
| A．happen | B．exist | C．survive | D．appear |
The National Stadium which looks very magnificent ____258,000 square metres in area.
| A．is measuring | B．is measured | C．measured | D．measures |
There was a hole in the door, through which I sight of Mr. Brown sitting in a chair.
| A．caught | B．made | C．took | D．got |