If you really have to leave during the meeting, you’d better leave ____ the back door.
| A．for | B．by | C．across | D．out |
When Madam Curie did the science experiment again, she was more careful where she_____ a mistake.
| A．made | B．has made | C．was making | D．had made |
Since the beginning of the vacation, I_____ across the country, and my next stop is the Wuyi Mountain.
| A．had travelled | B．will travel |
C．have been travelling | D．was travelling |
Attention, please, everybody! Please stay_____ while I take a photograph of you.
| A．still | B．calm | C．quiet | D．alive |
We should realize that there are other things that society should value besides high marks, _____ honesty and responsibility.
| A．for example | B．namely | C．such as | D．that is |
What should we use for power when all the oil in the world has_____ ?
| A．run out of | B．used up | C．given out | D．given off |