China always plays ___ active part in fighting against ___natural disasters.
A. /; the B. an; the
C. an;/ D /; /
Thank you for your hard work last week. I don’t think we _______ it without you.
| A．could have managed | B．can manage |
| C．managed | D．could manage |
Suddenly a good idea occurred to her, but she couldn’t find any paper ______.
| A．to write | B．to write on |
| C．written | D．writing on |
Thailand has decided to begin building its first standard-gauge railways in cooperation with China, ______may cost $12.2 billion.
| A．when | B．that | C．it | D．which |
— Excuse me, can you show me the way to the nearest bus stop?
— Sorry. I’m a stranger here. I ______ here until my guide arrives.
| A．stand | B．have stood |
| C．am standing | D．will stand |
When Mary arrived she found all her children ______ for nearly two hours.
| A．have gone to sleep | B．fell asleep |
| C．was falling asleep | D．had been asleep |