_____ 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
With the word“PM2．5"_____ appearing in media reports，people pay greater attention to it and seek health tips for smoggy days．
A．constantly B．instantly C．rarely D．directly
