--- What has made him upset recently?
--- __________ alone to face a troublesome case．
| A．Left | B．Being left | C．Having left | D．To leave |
______ 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 |
Newspapers, radios, the Internet can often help to solve problems by _____ attention to
situations _____ help is really needed.
| A．taking; which | B．drawing; where | C．paying; that | D．attracting; / |