Only after he realized the significance of mastering two languages ______ English carefully.
| A．did he set about learning | B．did he set out learning |
| C．had he set about learning | D．had he set out learning |
_____ 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 |
When he was a boy, he used to go there and watch _____.
| A．to repair bicycles | B．bicycles to be repaired |
| C．bicycles being repaired | D．repairing bicycles |