The past two years ________ a sharp rise in oil price，which adds to the burden of auto transportation industry.
| A．witnessed | B．has witnessed |
| C．is witnessing | D．witnesses |
This is an ideal site for a university ______ it is far from The downtown area.
| A．provided that | B．now that | C．so that | D．in that |
I turned down his invitation to dinner as I didn't want to ______ on him.
| A．invade | B．disturb | C．interfere | D．impose |
I understand ______ preparation that staff must put in under pressure to meet the deadline.
| A．more than the enormous amount of | B．better than most the enormous number of |
| C．better than most the enormous amount of | D．fewer than the number of |
We should always keep in mind that ______ decisions often lead to bitter regrets.
| A．hasty | B．instant | C．prompt | D．rapid |
The scientist has made quite a few discoveries, ______ of great importance to the whole world.
| A．which I think they are | B．which I think are |
| C．I think which are | D．that I think they are |