Perhaps the day will come ____ people will be able to breathe clean air in cities．
| A．when | B．while | C．as | D．since |
---If I had time, I would go shopping with you.
---But you___ too busy.
| A．were | B．had been | C．are | D．have been |
Some companies are reported to have stopped production, having ________ working capital.
| A．run out of | B．run out |
| C．been used up | D．died out |
John was very upset because he was ________ by the police with breaking the law.
| A．accused | B．arrested |
| C．sentenced | D．charged |
In our daily life，everyone fails every now and then. It is how you ________ that makes a difference.
| A．react | B．replace |
| C．rely | D．request |
All of us didn't notice Tom come into the classroom because the light happened to ________ at that time.
| A．give in | B．put up |
| C．go out | D．switch off |