My brother is always making good use of the time _______ he can spare.
| A．when | B．in which | C．while | D．that |
I regret _____ hard at school, or I would have succeeded in passing the exam.
| A．not to work | B．having not worked |
| C．to have not worked | D．not having worked |
We should prevent such a silly mistake _____ again.
| A．occurring | B．to occur |
| C．to be occurred | D．from being occurred |
_____ full preparations, we decided to put off the meeting till next week.
| A．We did not make | B．Having not made |
| C．We had not made | D．Not having made |
I’m examining the article he has just finished _____ the possible mistakes in it.
| A．being corrected | B．to correct |
| C．corrected | D．having corrected |
How could he get the plan _____ without any one to support him?
| A．to carry out | B．carry out |
| C．carrying out | D．carried out |