Having been attacked by terrorists,______.
| A．doctors came to their rescue | B．the tall building collapsed |
| C．an emergency measure was taken | D．warnings were given to tourists |
- How long did David work here?
- For half a year, he didn't leave much_______on us.
| A．expression | B．instruction |
| C．conclusion | D．impression |
It remains to be seen________North Korea will remain stable under its new young leader.
| A．when | B．whether |
| C．why | D．That |
How did you manage to get to the school on time_________you missed the school bus?
| A．when | B．if |
| C．once | D．because |
Readers are required to________the rules of the library and mind their manners.
| A．review | B．confirm |
| C．observe | D．Manage |
Everything seems to be going______for the first two weeks after I moved to London.
| A．smoothly | B．vividly |
| C．frequently | D．generally |