We can never expect _______ bluer sky unless we create _______ less polluted world.
| A．a; a | B．a; the | C．the; a | D．the; the |
______is known to us all is that the 2008 Olympic Games will take place in Beijing.
| A．It | B．As | C．what | D．which |
The computer system_____suddenly while he was searching for information on the Internet.
| A．broke down | B．broke out |
| C．broke up | D．broke in |
I think it is your brother who ______for your being late.
| A．is to blame | B．is going to blame |
| C．is to be blamed | D．should blame |
When______help, one often says “Thank you”. or “It’s kind of you”.
| A．offering | B．to offer |
| C．to be offered | D．offered |
We trust you; only you can ____ him to stop smoking.
| A．suggest | B．attract |
| C．advise | D．persuade |