—Where's that report?
—I brought it to you ________ you were in Mr.Black's office yesterday.
| A．if | B．when | C．because | D．before |
John is the only one of the students in our class that never ________ a mistake even when it is pointed out to him.
| A．admit making | B．admits making |
| C．admit to make | D．admits to make |
Only after leaving home ________ the true meaning of the proverb, “East or west, home is best.”
| A．he understood | B．he did understand |
| C．did he understand | D．had he understood |
--- Why do you suggest Mount Lu?
--- I believe________ beauty of nature there will make________ excellent impression on you.
| A．不填; an | B．the; the |
| C．a; the | D．the; an |
-–Could you take my place and go to meet Smith?
---________.
--- He is a tall man wearing short hair.
| A．Why me this time? |
| B．Are you familiar with him? |
| C．How can I recognize him? |
| D．What would you like to tell me? |
The population of Africa is ________ so rapidly as to cause great concern of the whole world.
| A．expanding | B．stretching |
| C．extending | D．spreading |