_______ is the most useful invention?
| A．Do you think which of these | B．Which of these do you think |
| C．Which of these you think | D．You think which of these |
We walked as fast as we could _____ to catch the train.
| A．hoping | B．to hope | C．we hoped | D．being hoped |
_____, I don't like her sister.
| A．Telling the truth | B．Been told the truth |
| C．To tell the truth | D．To tell the true |
Walking down the street the other day, _____.
| A．I saw unusual something happened | B．a terrible accident happened |
| C．something unusual was seen by me | D．I saw a terrible accident |
_____ many times, but he still couldn't understand it.
| A．Having been told | B．Though he had been told |
| C．He had been told | D．Having told |
_____ the meeting himself gave them a great deal of encouragement.
| A．The president will attend | B．The president to attend |
| C．The president who attending | D．The president's attending |