Many experts seem to agree that _______ certain limit should set on ________ consumption of cars to ease air pollution.
| A．a; the | B．/; the | C．the; / | D．the; a |
What I wanted to know was when and where the meeting______.
| A．was holding | B．had held | C．was to hold | D．was to be held |
For some time now, Chinese people, under the leadership of CPC, ______ the contents of the Scientific Development Theory in the course of practicing socialism in China.
| A．had been improving | B．have been improving |
| C．were improving | D．improved |
Mr. Smith would have come to see you if it had been possible, but he __________ so busy.
| A．was | B．had been | C．has been | D．were |
--- Could you tell me what he said just now?
--- Sorry, I ______ what was going on outside.
| A．had thought | B．was thinking | C．thought | D．think |
The unemployment rate in this district from 6% to 5% in the past two years.
| A．has fallen | B．had fallen | C．is falling | D．was falling |