. As there is less and less coal and oil, scientists are exploring new ways of making use of ______ energy, such as sunlight, wind and water for power and fuel.
| A．primary | B．alternative | C．instant | D．Unique |
Your desk is crowded with too many unnecessary things, including used papers and books. You’s better ______ some of them.
| A．remain | B．recover | C．remove | D．replace |
As is universally recognized , our strong sense of national ________ has been shaped by our history.
| A．identity | B．accent | C．difference | D．power |
It was a ________ that the whole family survived the earthquake.
| A．mercy | B．trick | C．loss | D．incident |
— Wow，you won first in the story-telling competition. Fantastic!
— ______ !
| A．Give me five | B．Congratulations |
| C．That’s all right | D．Forget it |
______ around the clock for two days，David managed to finish the report for the manager on schedule.
| A．Working | B．Worked |
| C．Having worked | D．To work |