Before you pay a visit to a place of interest，look in your local library________a book about it. (2013·安徽，22)
| A．on | B．at |
| C．for | D．to |
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 |
- Do you have______ready for the opening ceremony. Ted?
- No. we still need some volunteers.
| A．everything | B．somethng |
| C．anything | D．nothing |