___ is the most useful invention?
| A．Do you think which of these | B．Which of these you know |
| C．Which of these do you know | D．You know which of these |
As the prisoner had been ______from the outside world for twenty years, he had no idea what the outside world was like.
| A．cut off | B．cut away |
| C．cut out | D．cut short |
It makes little _____now to tell our children that their grandparents once boiled leather shoes to stop their hunger on their way to the northeast.
| A．idea | B．meaning |
| C．sense | D．use |
If you don’t know that _____ is the mother of success, you are sure to be _____ in life.
| A．failure; failure | B．a failure; a failure |
| C．a failure; failure | D．failure; a failure |
Don’t be too ______ about what you eat, or you are likely to develop an unbalanced diet, which is harmful to your health.
| A．special | B．particular |
| C．concerned | D．worried |
Thanks to the Party’s opening and reform policy, people in China are ______ than they were thirty years ago.
| A．well off | B．much better off |
| C．more better off | D．quite better off |