— Have you any letters _____?
— No, thanks.
| A．to be typing | B．to type |
| C．to be typed | D．typed |
27．To shut your eyes to facts．as many of you do,_______foolish．
| A．is | B．are | C．are | D．Were |
26．There are all sorts of ways that employees can be successful_________obtaining the better office environment.
| A．in | B．On | C．about | D．For |
25. Thirty years ago this month，China's leaders launched an economic revolution.___________the door to free market reforms and foreign trade．
| A．to open | B．opened | C．opening | D．having opened |
24．According to a UN report，30 percent of the world population have no______to clean drinking water and health care.
| A．means | B．approach | C．channel | D．Access |
23. It's reported that at least one Chinese vessel________in the hands of attackers in Somalia so far.
| A．had been | B．has been | C．was | D．Is |