If I ____ more about diamond, I ____ cheated by that man.
| A．had known, would not be | B．had known; wouldn’t have been |
| C．knew; would not have been | D．had known; would never be |
27. This new kind of chemicals will help keep the air, soil and water________ from pollution.
| A．free | B．empty | C．loose | D．Short |
26. Barack Obama has taken personal blame ________ the security failures which led ________ the attempt to blow up a plane on Christmas Day.
| A．of; to | B．for; to | C．on; on | D．in; on |
24. My father didn’t have to say anything. I knew he was upset from his ________.
| A．look | B．sight | C．appearance | D．Sign |
23. Cao Cao’s tomb is reported ________ in China, which attracts nationwide attention.
| A．being found | B．to be found |
| C．having been found | D．to have been found |
22. The chairman will be pleased at ________ scene that everything is in ________ place.
| A．a; a | B．the; the | C．the; 不填 | D．不填; the |