There is a new problem involved in the popularity of private cars ________ road conditions need ________.
| A．that；to be improved | B．which; to be improved |
| C．where；improving | D．when；improving |
The announcement ______all flight were cancelled because of bad weather greatly distressed the waiting passengers.
| A．that | B．which | C．why | D．of which |
______surprises most of us.
| A．Wolves are afraid of us | B．The fact that wolves afraid men |
| C．The fact that wolves are afraid of men | D．Wolves’ afraid of men |
I haven’t decided _____ hotel to stay at.
| A．which | B．what | C．at which | D．where |
. The thief had himself _____ by the police when he was trying to break into the hotel.
| A．to spot | B．to be spotted | C．spotted | D．being spotted |
The reason was _____ I was busy with my work at that time.
| A．why | B．because of | C．that | D．what |