I failed in the examination last term and only then ____ the importance of studies.
| A．I realized |
| B．I had realized |
| C．had I realized |
| D．did I realize |
New technologies have made possible to turn out new products faster and at a lower cost.
| A．that | B．this | C．one | D．it |
The audiencewhen they watched his funny performance.
| A．burst into laughing | B．burst out laughter |
| C．burst into laughter | D．burst in laughing |
Every day we are using so many raw materials which _________that they _________.
| A．are running out; will be used up |
| B．are being run out; will run out |
| C．have run out of; will be using up |
| D．have run out; will run out of |
_______the fierce competition in finding a good job in big cities, many fresh graduates are still trying their fortune in Beijing.
| A．Apart from | B．Regardless of |
| C．Instead of | D．With regard to |
______ the Internet is of great help, I don’t think it is a good idea to spend too much time on it.
| A．Unless | B．Since | C．When | D．While |