. _____is known to us all is that the old scientist, for____ life was hard in the past,still works very hard in his eighties.
| A．As; whom | B．What; whom | C．It; whose | D．As; whose |
World leaders have to face the fact that ________ global warming has become perhaps ________ most complicated issue.
| A．/；the | B．/；/ |
| C．the；the | D．the；/ |
I'm a fresh hand so I don't think I can do it well.
－________Something attempted，something done.
| A．Come on. | B．It just depends. |
| C．Why not? | D．I think so. |
The couple overjoyed ________ words on hearing their son survive the airplane crash by a miracle.
| A．of | B．in |
| C．beyond | D．above |
Around the world there are many young people________a great deal of money on listening to pop or rock music.
| A．spending | B．spend |
| C．to spend | D．spent |
A British scientist has predicted that parents who lose children in accidents may be able to clone “copies” to________ them within 50 years.
| A．take place | B．take place of |
| C．take the place of | D．in place of |