Had they known what was coming next, they ___________ second thoughts.
| A．may have | B．could have | C．must have had | D．might have had |
_______, and we will do the work better.
| A．Give us more time | B．Given more time |
| C．Giving us more time | D．Having given us more time |
With just four years _______, the Brazil Olympic organizers have promised to deliver an equally inspirational ceremony.
| A．gone | B．to go | C．going | D．go |
________ seems to be no possibility _______ the shy girl can win the first prize in the contest.
| A．There; whether | B．It; whether | C．There; that | D．It; that |
It took a long time for the effective use of natural gas ______.
| A．making | B．being made | C．to make | D．to be made |
Although the couple didn’t choose to sleep in the wild instead of in the hotel, it_______ unexpectedly beautiful.
| A．turned around | B．turned down | C．turned out | D．turned up |