57. The rain was coming down in buckets. This sentence means ____ .
| A．The rain was coming down into the buckets. | B．The rain was very heavy. |
| C．There was some rain in the buckets. | D．There were some buckets in the rain. |
The villagers have already known __________ we’ll do is to rebuild the bridge.
| A．this | B．that | C．what | D．which |
The pop star walked out of the stage, ______ her hands to her crazy fans.
| A．waving | B．was waving | C．waved | D．to wave |
Not until he left his home ______ to know how important the family was for him.
| A．did he begin | B．had he began | C．he began | D．he had begun |
It is reported that the newly-built studio is _______ badly.
| A．equipped | B．equaled | C．supplied | D．offered |
If you happen to get lost in the wild, you’d better stay ______ you are and wait for help.
| A．why | B．where | C．who | D．what |