____ lies in North America.
| A．The United State | B．The United States | C．United States | D．A United State |
It was last year _____ I visited the museum _____ you had visited.
| A．that; that | B．when, where | C．that; where | D．when; that |
______ when to leave, I could only stay at home, _____ nothing.
| A．Knowing not; done | B．Not knowing; doing |
| C．Having not known; done | D．Not having known; doing |
While building a tunnel through the mountain, _____.
| A．an underground lake was discovered |
| B．workers discovered an underground lake |
| C．there was an underground lake discovered |
| D．a lake was discovered underground |
— I wonder if I could use your phone for a while?
— _____.
| A．It's a good idea | B．Why not? Do it for yourself |
| C．Of course. Go ahead | D．It's my pleasure |
.We don't have many workers coming to the job interview. I'm afraid we may _____ workers
this time.
| A．be a shortage of | B．have a shortage of |
| C．be short of | D．be in short of |