-----Who has made a mess in my room?
-----Who else it but your naughty son?
| A．could do | B．could have done | C．did | D．had done |
Not until the motorbike looked almost new ______repairing and cleaning it.
| A．he stopped | B．did he stop | C．stopped he | D．he did stop |
_________ the task , they have to stay there for another two weeks.
| A．Not completing | B．Not completed |
| C．Not having completed | D．Having not completed |
Visitors were struck by the natural _________ here, which was beautiful beyond description.
| A．resource | B．scenery | C．disaster | D．element |
If you don’t explain clearly, you will just _______ the reader.
| A．confuse | B．satisfy | C．intend | D．remind |
Gun control is a subject ________Americans have argued for a long time,
| A．of which | B．with which | C．into which | D．about which |