She brought with her three friends, none of _____ I had ever met before.
| A．them | B．which | C．whom | D．who |
While building a tunnel through the mountain, _______.
| A．an underground lake was discovered |
| B．there was an underground lake discovered |
| C．a lake was discovered underground |
| D．the workers discovered an underground lake |
_______ book of this writer is East and West.
| A．Known to be the best | B．It was the best known | C．Known as the best | D．The best known |
All the rooms are _______ with electric light.
| A．supplied | B．given | C．offered | D．burnt |
We waited _______ for the bus.
| A．long time | B．a long time | C．the long time | D．some long time |
The first textbook _______ for teaching English as a foreign language came out in the 16th century.
| A．having written | B．to be written | C．being written | D．written |