The astronauts were so struck by ______beauty of nature that they took lots of pictures in _______space. 
21.
| A．the ; / | B．the; the | C．/; the | D．/;/ |
________ she is not so cheerful ________ she used to be?
| A．How it is that；as | B．How is it that；as |
| C．Is it why；that | D．Why is it that；what |
For more information about Cambridge，________our website at www.cambridge.org.
| A．visit | B．visiting |
| C．to visit | D．visited |
It sounds like something is wrong with the car’s engine.________，we’d better take it to the garage immediately. (2011·江苏，33)
| A．Otherwise | B．If not |
| C．But for that | D．If so |
This is not my story，nor ________ the whole story.My story plays out differently.
(2012·四川，5)
| A．is there | B．there is |
| C．is it | D．it is |
—Was it by cutting down staff ________ she saved the firm?
—No，it was by improving work efficiency. (2012·上海，37)
| A．when | B．what |
| C．how | D．that |