It was not until the teacher had explained it three times _______ how to work out the problem.
| A．did he understand | B．had he understood |
| C．that he understood | D．that he didn’t understood |
How I wish I ___ your advice when you first warned me.
| A．took | B．should take | C．had taken | D．have take |
All this ___ that knowledge comes from practice.
| A．speaks | B．proves | C．explains for | D．teaches |
___, the car started.
| A．The signal giving | B．The signal is given | C．The signal given | D．Having given the signal |
She ___ down her pen and stopped writing.
| A．lied | B．lain | C．laid | D．lay |
The old lady was ___ her wallet.
| A．stolen from | B．robbed of | C．stolen | D．robbed |