If we________ , we can realize the progress we have made in space research.
| A．turn back | B．look back | C．answer back | D．move back |
And there, almost _____ in the big chair, sat her little brother, who never had to be told to keep quiet.
| A．having lost | B．losing | C．to be lost | D．lost |
_____ the front door _____, he had to enter the room through the back door.
| A．Seen; painted | B．Seeing; painted |
| C．Being seen; being painted | D．Seeing; being painted |
_____ the diamond, he had to look for a place to hide it.
| A．Having stolen | B．Having been stolen |
| C．Stolen | D．Stealing |
The dog, _____, will be made a good watchdog.
| A．to train properly | B．being trained properly |
| C．properly to train | D．trained properly |
- Have you considered _____ your job as a teacher?
- Yes. I like the job because a teacher is often considered _____ a gardener.
| A．to change; to be | B．to change; being |
| C．changing; being | D．changing; to be |