---You didn’t lock the back door.
---You are wrong. I ______.
| A．have locked it | B．lock it myself |
| C．did lock it | D．do lock it |
_____ more than 100 million references to the word“tuhao” on social media since early September．
| A．It has been | B．There is | C．There have been | D．They are |
一You seem to be familiar with this city．
一I_____ here for three years．It’s great to be back．
| A．will live | B．lived | C．had lived | D．live |
The so-called Asia—Pacific century will make no sense_____ China develops．
| A．unless | B．when | C．if | D．as |
Whether you like it or not，we live in a community_____ on--line chatting is an important part of communication．
| A．which | B．that | C．when | D．where |
The No．1 underground，hopefully_____ in the near future，will greatly improve the traffic conditions in Fuzhou
| A．opens | B．to be opened | C．open | D．will be opened |