While building a tunnel through the mountain, ______ ．
| A．an underground lake was discovered |
B．there was an underground lake discovered |
C．the workers discovered an underground lake |
| D．a lake was discovered underground |
You will be successful in the interview ______ you have confidence.
| A．before | B．once | C．until | D．though |
The factory was built in a secret place, around ____ high mountains .
| A．which was | B．it was |
| C．which were | D．them were |
The question is ____ of great importance.
| A．that | B．it | C．one | D．what |
Yes,___ is difficult to find a job nowadays, but ____ is more difficult is to try to find such a job with a high salary but little work to do.
A it ; it B. what ; what
C. it ; what D what ; it
Some of the people had ____taken up their arms.
| A．truly | B．actual |
| C．in the fact | D．actually |