In the past 30 years China ______ great advances in the socialist revolution and socialist construction.
a. has made b. have made c. had made d. having made
_____ people are waiting to watch the raising of the national flag at Tian’an Men Square.
| A．Hundred | B．Thousand | C．Two hundreds | D．Thousands of |
The new library building _____ last week.
| A．was completed | B．is completed | C．completed | D．has completed |
—Did you call Sara back?
—I didn’t need to, _____ we’ll have a meeting together tonight.
| A．though | B．unless | C．because | D．if |
Keep practicing and you _____ your English.
| A．improve | B．will improve | C．improved | D．were improving |
The air in mountain areas is ____ that in big cities.
| A．as fresh as | B．fresher than | C．as dirty as | D．dirtier than |