As a result of destroying the forests, large ____ of desert ____ covered the land.
| A．number; has | B．quantities; has | C．number; have | D．quantities; have |
Few people seem to care about what a super star _____ before he/she became famous.
| A．goes through | B．is going through | C．have gone through | D．had gone through |
I know Mr. Shuili; we ______ to each other at an English lecture.
| A．were introduced | B．are been introduced | C．are introduced | D．had been introduced |
Little ______ that we were watching his every move，so he seemed to be going his own way in this business.
| A．he knew | B．he didn’t know | C．didn’t he know | D．did he know |
The report was not concrete and in a way lacked persuasion, but _____,I felt it is fair.
| A．above all | B．in others words | C．on the whole | D．on average |
Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.
| A．before | B．that | C．since | D．when |